Hello,

You can get air under 100 if you start from the scratch. All you need is hard work and consistency.

There is 1 year and if you start now you can do it. Clear your basics, boards. Refer ncerts related to that topic/subject.

If you want to join academy it's also good as they are always updated and provide you lessons according to updated syllabus. As they also takes mock tests.

It's also possible when you do self study. Refer good books, practice a lot, revise, take self notes.

Mock tests, mcq practice.

If you're starting from scratch don't go directly to ncert it'll be bit difficult. Go for board syllabus books and refer ncerts.

Hope it helps. Best of luck.