what are the topics that cover the maximum weightage in the examination ??

Dear sailasri

For iit jeee there is no fixed weitage, it  vary from year to year...
if you will see the pattern of last year papers,then you will find that question were framed in such a way that it include more than one chaptre. and in whole paper almost entire syllabus are covered

The section-wise breakup of marks in the past four years  JEE  has been given below for your reference.

PHYSICS
'Electrostatics and Current Electricity', and 'Electromagnetism'-each of these topics has contributed about 15% to the total marks

'Optics' too contributes approximately 13% to the IIT-JEE

In the past four years, approximately 20% of the total marks pertain to Mechanics. Within Mechanics, the favorite topics seem to be 'Rigid Body Rotation' and 'Motion on a Plane'.

'Mechanical Waves' (sound) has accounted for approximately 12% of the total marks.

CHEMISTRY


'Organic Chemistry' has the highest weightage with mean marks of 36%. Topics like 'Isomerism' and 'Name Reactions', and 'Stability of reaction intermediates' should be thoroughly covered.

'Physical Chemistry' is a close second with a mean weightage of 33%.

'Inorganic Chemistry' and 'General Chemistry' account for 21% and 10% of the total marks. Inorganic Chemistry should be prepared by studying the group properties and periodicity.

MATHEMATICS
'Calculus' accounts for about 30% of the total marks in JEE Screening.

'Algebra' has a weightage of about 23% of the total marks.

'Analytical Geometry' has a weightage of about 20% of the total marks.

The topics of 'Vectors and 3-D Geometry' and 'Probability' have a weightage of approximately 6% each.

'Trigonometry' carries a weightage of about 9%. It has been observed that this weightage was as high as 17% in JEE

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Badiuddin