Hi Maheswar,
Don't worry. I feel that every Organic Chemistry chapters are very much interrelated with some hidden story so once you made your foundation of it strong then all the chapters will seem very easy and scoring. You just have to follow the logic and need good memorization to excel at it. You have to apply as much as you remember. just take time and go through the each chapter thoroughly after you made your basics clear.
I will try to suggest you some good tips for it.
Follow these tips, and I hope it will help you for.
To know the syllabus of class 12th JEE, you can follow the below link.
https://engineering.careers360.com/articles/jee-main-syllabus
To see class 12th board syllabus, you can go through it by visiting the link below.
https://school.careers360.com/articles/cbse-class-12-chemistry-syllabus
All the best!
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