I will give you a subject-wise list of the "most" important topics, the ones which give you a lead. Pardon me and add if I forget some.

Physics:

Electrostatics & Gravitation(conceptually similar)
Current Electricity & Heat Transfer(conceptually similar)
Electromagnetic Induction

Waves (Sound as well as optics)

Geometrical Optics

Thermodynamics and KTG

Rotational Dynamics

Dimensional Analysis - Not a well taught topic but it can help you eliminate many options.

Mathematics:

Matrices and Determinants
Definite Integration
Vectors and 3D
Differential Equations
Conic Sections and Straight Lines
Basic Equation Solving(Trigonometric, Quadratic, Bi-quadratic)
Sequences and Series
Formulas of a triangle

Chemistry:

1.Chemical Bonding & the periodic table(the only chapter if done perfectly can clear most of your doubts in inorganic as well as organic chemistry) ==> makes it easier to learn Coordination Compounds and predict a hell lot of properties ranging from MP,BP, Solubility to reactivity, optical rotation and what not !

This chapter is a necessity if you want to learn chemistry.

2.Carbonyl Compounds & their derivatives

3.Redox reactions, Mole Concept & the concept of equivalents(they have multiple applications in equation balancing to predict the products of a reaction, electrochemistry, inorganic chemistry)

4.Solid state, solutions & gases theory

5.Thermochemistry & the Second Law of Thermodynamics

These should be your strong topics although you should go through others too atleast once.

Wishes !

the following link is for answer key
notes:- answer can be wrong so please dont loose hope :D
jee mains key

1.physics or click here
https://docs.google.com/file/d/0Bwb9j3hAO4PubkotUkg4LVJORHM/view?pli=1&sle=true
2. maths or click here
https://docs.google.com/file/d/0Bwb9j3hAO4PuWkszYktBTkhZc0U/edit?pli=1

resonance answer key for set E

hello everyone,
for last few days you must go through all formula especially for jee main.
and in order to revise all formula we have formula booklet.as this is blog and i cant upload file so here i am attaching the list to SCRIBD

for physics

XII-Formula-Booklet-Physics-XII
XI-Formula-Booklet-Physics-XI

for maths

BOTH COMBINED Booklet-maths

for chemistry

NCERT is sufficient and brief also.
go through all reaction in inorganic part

-none of above booklet are owned by me.thanks to there creator.

Maths - Any good book will do, just as long as it has thousands of problems (I'm serious). But here are some of the books I know and have used:NCERT, Tata McGraw Hill, G. N. Berman, A. I. Prilepko, Hall & Knight, S. L. Loney.

Physics - Just three - NCERT, H.C. Verma and I. E. Irodov. If you want really challenging problems, try the Krotov.