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Being IIT-JEE/AIEEE/AIPMT the tougher job. Special preparation and the right approach are required. The right time to start preparing for the IIT-JEE, is immediately after the Std X exams. But, for those who haven't got down to it as yet - it's never too late to start.

Firstly, it is important to recognise the requirement of the exam. Even the question-setters do not expect the students to answer all the questions correctly in the given time frame.

The proof of this lies in the fact that never in the recent history of the exam have the minimum qualifying marks been more than 35 per cent. So, logically, if you can score even 40 marks in each paper, you can very well obtain a rank higher than 1500. (And this is a conservative estimate. In fact, in the math paper, the minimum qualifying marks reached an all-time low of 17.)

Here are the tips for you to crack these exams. Apart from an able guidance of a teacher, following points should be kept in mind, while preparing -

Aim to master around 60 per cent of the syllabus. This is for those students who have been out of touch with JEE for, say the past five or six months. But for those who have been putting in a steady number of hours, it is possible to complete 80 per cent of the syllabus.
What should you study and what should you leave out? That's simple. Every subject contains some topics that are either difficult to comprehend or that require more time to develop an intuitive insight in order to understand the underlying difficulty in apparently simple forms. Friction, rotational motion, fluid motion, wave mechanics, volumetric analysis, ionic equilibria, hybridisation, heights and distances, combinotonics, inequalities, induction, binomial coefficients are some such topics.
If you haven't developed a working relationship with them so far, then avoid them for the present. At the same time if you are comfortable tackling such topics, do include them. They carry a good 12-20 per cent of the total marks. Remember: what is learnt with pleasure is learnt in full measure. As for the easier topics, there's only one way out: master them. These must be included in your 60 per cent.
The right reference materials make a big difference. The IIT guides for Physics (Gupta & Gupta), Chemistry (O P Agrawal) and Mathematics (Khanna & Sharma) published by Tata-McGraw Hill and J T Nath come highly recommended. Use text books which contain large number of solved problems. While going through the solution, concentrate more on why that particular method is being used rather than mugging up the method mindlessly.

As coaching classes are in vogue, students can avail of this facility as well. However, take assistance from those teachers who specialise in analysing instead of just solving problems.

Here is a suggested list of topics that you should master first before others:

Physics : Thermodynamics, Conduction and Convection of Heat , Hydrostatics and Bernoulli's Principle, Waves in Elastic Media, Interference Beats and Doppler's Effect, Electrostatics (full) , Electromagnetic Induction, Lorentz' Forces, Circuits with Capacitors, Modern Physics (full), Collisions, Rotational Motion, Gravitation, Elasticity, S.H.M.
Chemistry : Atomic Structure, Bonding, Redox Reactions, Volumetric Analysis, Chemical Equilibrium and Kinetics, Ionic Equilibria, Electrochemical Cells, Solutions, Hess's Law, Organic Chemistry (full) with special stress on reaction mechanism of reactions named in the syllabus, Oxyacids of P,S, C & N, Properties of Ozone Thiosulphates, H2O2, Coordination Compounds.
Mathematics : Calculus (full), Quadratic Equations and Expressions, Complex Numbers, Progressions, Solution of Triangles, Solution of Trigonometric Equations, Vector Analysis, Straight Lines, either Circles or Conic section.

In the examination hall, the moment you receive the paper, scan it. Look for problems that are from the topics you have studied. (Never mind if they are objective or subjective). Ignore the others and solve the chosen ones first, at one go - till you've attempted everything you know. If say in two hours (out of three) you have been able to attempt and solve thirty percent of the paper you will be a confident person.
This confidence may help you in cracking those problems you overlooked the first time. A 100 mark paper is supposed to be solved in 170 minutes. Keep 10 minutes for tying up supplements and other such formalities. It actually works out to 1.7 minutes per mark.
If a particular problem carries, say 6 marks, you should allot about 12 minutes to it (maximum 15). Do not get bogged down by a particular problem. If there is no solution in sight for next few steps - drop it, leave some space and go on to another problem. You must endeavor to reach the end of the paper by say 150 minutes.
It has been noticed that the simpler problems are often found towards the end of the JEE paper.
Most important: keep your cool all the time. If you have not performed well in the first paper - don't let it affect your performance in second or third papers. You still stand a good chance and worrying isn't going to help. It is wise not to discuss the papers at all till the last one is over.
One final piece of advice: Instead of ruminating over the time lost - use these power-packed 320 odd hours to help you achieve entry into one of the most coveted institutions in the country. You really can if you think you can. So, rush to your study table. Your time starts NOW!

TAKEN FROM:http://www.iit-jeephysics.com/Tips.html

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