I'll give you some tips possibly as I've been through this stage couple of years back.. But I'll give the answer in the app here itself and cannot email you as this is against our policy.

Study NCERT for Chemistry and Physics especially. Try to finish almost all the chapters up to a premature level rather than covering some chapters to a Pro-Level, as in Mains most of the questions will be easy to moderate level so it makes sense to prepare all up to an average level. Don’t think in terms of marks during the examination, just keep one mindset while attempting the paper- ‘Let me first find out the easiest and less time-consuming problems in the paper in all three subjects and solve them first properly’, without calculation mistakes and pressure. Plan your schedule very properly. Give proper time to all thee three subjects. Try to stay away from distractions like social media YouTube, etc etc. And solve mock papers once you come closer to examinations.

Best wishes. Thank you.