JEE Mains 2013 : Analysis, Expected Cut-offs for JEE Advanced and Rankings

On April 7, 2013, over 10 lakh students appeared for JEE Mains that will act as a screening examination (in conjunction with Class XII Board Examination marks) for JEE Advanced to be held in June 2013. JEE Mains (with Class XII Board Examination marks) will also be the basis for admission into the NITs and other regional engineering colleges across India.

Many websites have already published the solutions to the JEE Mains paper and students must be having an idea of the approximate score they will get. But as always, the relative score matters for which this analysis is presented. To carry out this analysis, I have also talked to at least 60 students (intelligent, average, below average and poor) who took the examination this year to gauge the level of difficulty of questions and come up with the expected rankings vs score of students as well as the qualifying score for JEE Advanced. Not to forget that Class XII Board Examination marks have not been considered in this analysis. However, the inferences presented in this article should not be very different even after considering Class XII Board Examination marks.

JEE Mains this year had just one paper that had all three subjects – Mathematics, Physics and Chemistry with equal weightage. There were 90 questions in all, 30 of each subject and the total marks was 360 (120 marks for each subject). Overall, the paper was easy with the difficulty level of questions only slightly higher than Class XII Board Examinations. The type of questions asked were “Single Correct Answer Type” and “Assertion-Reason Type”.

The real test here was of speed that I had been stressing on in my articles and during my interactions with students at Patna Book Fair and other seminars. So, students who had been following my series of preparatory articles on www.gyancentral.com, especially the last week preparation series

(http://www.gyancentral.com/articles/graduate/engineering/indian-institutes-of-technology/jee-2013:-solving-aieee-papers-is-going-to-help-especially-with-mathematics) should easily be able to qualify for this year’s JEE Advanced. Especially in Mathematics, I had advised to go through Eduwiser’s Mathematics Series by Prof. K. C. Sinha and you will notice that all the Mathematics questions asked in JEE Mains this year were directly from these books.

Fig. 1 : Level of Difficulty

Talking about the difficulty level, I personally found Mathematics easier than the other two. But based on the student and teacher feedback, the chart shows the level of difficulty of questions in each subject. So, among the individual subjects, Chemistry was supposedly easier whereas Physics was the most difficult (comparatively). The numbers also clearly indicate that attempting the right questions in the examination can easily let any aspirant through, since there are sufficient number of easy questions asked; you just need to find them in the paper.

The above figures give you the topic-wise break-up of each subject. In each subject, if you had concentrated on preparing the chapters I had asked you to, you must have scored well. As expected, Coordinate and Vectors/3-D formed 27% of the Mathematics portion and all these questions were pretty straight forward and hence less time-consuming. Algebra formed the major portion of Mathematics as is always the case.

In Physics, Heat, Electrostat, Current & Magnetism, Modern and Sound formed more than 50% of the Physics paper. In Physics, a couple of questions were tricky and one question from Modern Physics (the one on modulated frequency) was out of syllabus, which made the paper a little difficult.

In Chemistry, if you had control over Physical and Organic Chemistry, the paper must have been a cakewalk for you.

Coming to the most important part of this article – expected ranking of students who know their approximate scores and the expected cut-off for JEE Advanced 2013.

Since I believe in equal opportunity for all, I am only going to discuss the cut-offs for the General Category. According to my analysis, the topper is expected to get about 342 marks. I talked to the FIITJEE topper and he has scored 330. So, the topper is expected to be from some other Coaching Institute. The competition will become very tough in terms of marks as we go lower down the rankings. 

The cut-off for JEE Advanced for General Category according to me, should be around 129 marks (refer the given table; considering only 51% of 150,000 = 75000 approx. will qualify for JEE Advanced). 

Tabulated above is the aggregate score against one’s expected ranking according to my analysis.

The actual data will however be known only when the results are out on May 7, 2013 (on this date, only the scores will be released). Until then, we can only publish the ‘expected’ rankings and ‘expected’ cut-offs. The Class XII marks also need to be considered for the actual rankings. The way forward for students now is to focus on other major examination(s) – be it JEE Advanced and/or some regional engineering entrance examinations.

If you have any questions/comments, you can interact with me on www.facebook.com/abbyshekchandra

Wishing all the students “All the Best” for their results and their upcoming examinations. Hope the article helps!

Disclaimer : All the data in the article are solely based on the author’s individual analysis. The author does not guarantee the numbers to match the actual outcome.

JEE 2013 Preparation – Week 10

Following is the plan for this week :

MATHEMATICS :

Start Permutations and Combinations from Eduwiser’s Algebra by Prof. K. C. Sinha. It will help to go through the Section I of this chapter first. Go through the theory and “Worked Out Examples” thoroughly. You do not need to solve each question from the exercise of Section I here.

Once you are done with it, start Section II. Go through the “Summary of Results” first. If you have any doubts understanding the results, refer Section I theory again but be thorough with the theory and concepts involved. Each book in the market has a different way of solving the same question. What I have noticed is that, in other books, the methods explained are not general and cannot be applied to most of the questions. That is why things become a little difficult and confusing in this chapter. But with the book I have suggested, you should be able to find general methods of solving different types of questions. Going through the “Worked Out Examples” will help you clarify and brush-up your concepts of the chapter and the methods you would have learned from the same book. You should then solve all the questions (including “Prove that” ones) from the book. Lay emphasis on new pattern questions. If you fail to solve any question, give it a try next week but in case you still are not able to solve the question next week, get help from your teachers.

Also try to solve new pattern questions from any source possible. You will also be able to get abundant questions from this chapter on the internet. Try solving them using the concepts you have learned from the book.

After you are done with Eduwiser’s Algebra, work out questions of the chapter from Eduwiser’s Mathematics for AIEEE. Here, you should again try to take timed tests of yours to build your speed. The entire Permutations and Combinations should eat up about twenty hours of your time.

CHEMISTRY :

In Physical Chemistry, we will cover the following topics of Nuclear chemistry:  Radioactivity: isotopes and isobars; Properties of α, β and γ rays; Kinetics of radioactive decay (decay series excluded), carbon dating; Stability of nuclei with respect to proton-neutron ratio; Brief discussion on fission and fusion reactions.

You just need to refer to “Worked Out Examples” from Dr. P. Bahadur’s Physical Chemistry and “Worked Out Examples” with exercise from Dr. R. C. Mukherjee’s Physical Chemistry. This chapter becomes very important because of two reasons. One, there is minimal risk with this chapter. If you have sincerely solved all the questions from the books suggested, chances are high that you will be able to solve the questions of JEE Mains and Advanced. You can test this by trying to solve questions asked in previous years’ IIT-JEE. Two, the same chapter appears in Modern Physics. With the same theory, you should be able to solve questions asked in Physics from the same chapter.

Also try solving questions from previous years’ IIT-JEE and new pattern questions from various sources. This chapter will take approximately ten hours of your time.

The target for Organic Chemistry will be to finish Carboxylic acids: Formation of esters, acid chlorides and amides, ester hydrolysis. Follow your Coaching Classes notes or Prof. S. Lal’s Organic Chemistry along with Morrison and Boyd for concepts that you do not understand. Try to justify each reaction of the chapter as you study.

Also solve questions that have been asked in previous years’ IIT-JEE and clarify your doubts as soon as possible. Organic Chemistry should consume about eight hours of your time.

In Inorganic Chemistry this week, you can cover Sulphur: hydrogen sulphide, oxides, sulphurous acid, sulphuric acid and sodium thiosulphate; Halogens: hydrohalic acids, oxides and oxyacids of chlorine, bleaching powder; Xenon fluorides from your Coaching Classes course material or NCERT books. At this time, you should also solve questions asked in previous years’ competitive examinations. This should take nine hours.

PHYSICS :

For Physics this week, we will get rid of the following topics from Thermal physics: Thermal expansion of solids, liquids and gases; Calorimetry, latent heat; Heat conduction in one dimension; Elementary concepts of convection and radiation; Newton’s law of cooling; Ideal gas laws; Specific heats (C_v and C_p for monoatomic and diatomic gases); Isothermal and adiabatic processes, bulk modulus of gases; Equivalence of heat and work; First law of thermodynamics and its applications (only for ideal gases); Blackbody radiation: absorptive and emissive powers; Kirchhoff’s law; Wien’s displacement law, Stefan’s law.

Needless to mention, all this topics should be covered from Dr. H. C. Verma’s Concepts of Physics – Vol. 2. All the topics of Thermal Physics are high scoring, low risk topics. You have to be thorough with them. If you are thorough with them, there will be no question of JEE Mains and Advanced from these topics that you will not be able to solve. Special hint for the chapter on Heat Transfer from Dr. H. C. Verma’s book is to compare it to Current Electricity.

Try solving previous years’ questions from IIT-JEE, new pattern questions from Coaching Classes material and objective questions from Prof. Deb Mukherjee’s MCQ. Physics will take about twenty-three hours this week.

Until next week, all the best !

If you have any questions/comments, you can interact with me on www.facebook.com/abbyshekchandra