Hello,

Just Collect the NCERT book of +2 1st year and 2nd year. You can read it from now. But for you just prepare for 10th and clear it with distinction. Then after that day every second you can prepare for IIT. get your concepts clear and solve the numericals as much as possible Try to solve every question you see. Try to get the knowlege of every concept and chapter.

You can get the syllabus from the official webpage of Board NTA.

Hope it helps!