Dear

Its very important time for students,From now you should start working hard.
best method is to first read the theory part completly from the standard text book and study material and
then solve "solved examples" ,and them compair your methodology with the solution given in the text book.and see which is less time consuming. many a time student an solve the problem but the time taken by
them is much more which certainly decreses their rank.
and after solving these questions refer question of that chapter from previous  papers. and follow these
procedure chapter by chapter.and time to time solve sample papers .
and  do not waste your time in solving question that are very difficult .Many peaople frame such a
question which are not a part of  syllabus.and it is  just a wastage of time.

you should complete your syllabus before your board exam .And after your board exam you should only
revise. in that day you  can solve model papers at least one in a day . and study important concepts and
revise formulas.And during solving papers in which concept you feel difficulty ,refer books or study
material to remove your doubts .

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

Please feel free to post as many doubts on our discussion forum as you can.
If you find any question Difficult to understand - post it here and we will get you
the answer and detailed solution very quickly.

 We are all IITians and here to help you in your IIT JEE preparation.

 All the best.
 
Regards,
Askiitians Experts
Badiuddin