Well that would be a very big achievement and it is a very big dream too. To achieve it, first of all you should prepare yourself mentally well apart from the academics. You have to plan schedule and timetable for the day and execute them every single day so that with every passing day, you get closer to your goal.

Your concepts must be very clear and you should also have a wide experience of the varied types of MCQs. So solve decent books of all the subjects. You can use RD SHARMA for Maths, for physics you can use Marvel, HC  Verma, DC Pandey, etc.

Keep your focus on your goal without any distractions and keep studying more and more as much as you can.

Best wishes. Thank you.