Hi student,

If you study regularly for at least 6-7 hours, and read all the NCERTs of physics, chemistry, mathematics and biology, then also it will take you atleast 8 months to complete both class 11 and class 12 syllabus. This is because you don't just have to read the books, but you have to understand the concepts and theories behind the subjects. Also, NCERTs are books which are less in thickness but are very deeply written. You must go line by line in NCERT to understand theory as well as problem solving approach. Mathematics can be finished easily in less time but other subjects might take time.

However if you increase the time per day like 8 hours, then maybe you can finish in six months.

Hope it helps.

Good luck.