which topic we need to prepare more?

MATHS:

CO-ORDINATE:- straight line, circle, locus.
ALGEBRA:- complex no.,qudratic equation,probability,a.p.,g.p.
CACULUS:-LIMIT,CONTINUTY,integration,application of calculus.
Trigonometry all are important (carries near about -5marks each year)

PHYSICS:

mechanics,kinematics,vectors,gravitation,atomic physics, Electronics and electromagnetism.

CHEMISTRY:-

bonding, organic chemistry, metals.however tough questions are from physical part.

ABOVE MENTIONED ARE THOSE PARTS WHICH CARRY MUCH WEIGHTAGE IN IIT-JEE.

Best Of luck