Well, For a good score(75 & above ) in JEE is not a easy task! But it can be made easy. How? You have to put a lot of efforts. You need to follow following instructions/rules what I had followed:-

Book

NCERT class 11 & 12

+Study Material of any coaching Institute.*

Revision

PC!

Revise formula daily atleast for 15min.

In your free time try to revise important concepts.

IC

Learn all the concept from ncert and follow the coaching material

#Learn all the questions asked in previous papers(JEE ,Board CBSE)

Regular revision is mandatory!

OC

Must have the clear concept of basic of organic

Written revision of reaction mechanism is mandatory.

Try to built imaginative concept for entire Organic.

Questions

You need to solve atleast 50–60 question of each part i.e PC,IC,OC

Exam

Write exam atleast once in two week!

After exam clear all your doubts that you face at the time of exam.

Fianl Exam

You need to solve 26–30 questions.

You must feel like you are confident.

Important Chapters of chemistry☺

http://nuclear chemistry: https:...

http://Practical organic chemist...

http://Basic Concept of organic ...

http://Quantum mechanical model ...

http://Stereoisomerism:-Organic ...

http://Physical Chemistry Class ...

etc…

That's all.