Hello

A major part of B.Sc  syllabus is there in your net syllabus. In India most of the colleges now have semester system and all universities have almost same syllabus and the course pressure would be more or less same in every university. In B.Sc you wont be eligible for giving net exam. After you study in M.Sc. you will be eligible for net exam. So I would suggest you to first prepare for JAM and other M.Sc entrance exams first. And after getting into M.Sc. take preparation for NET. Study from books. Make a habit of studying from books. It will help you in future.

Hope this helps. Best of luck.