Gone are the days when people couldn't study due to financial crunch. There are many scholarship exams that you can write. AISEE is one entrance examination for scholarships in Medical and Engineering fields. This is an initiative by the Central Government where if you qualify in the exam, your studies will be funded by the Govt.of India through scholarship. You can check that. And every State Government has some scholarship programme for their SC/ST/BC Students. If you are from any one of these Categories, you should check their official website. There are also merit scholarships that colleges offer if you have good academic profile. So the world doesn't end because you do not have money. Will in heart, marks on the board, there are many ways out there. If you want to take up research in Physics, you can study B.Sc Physics to start off. Later you can study M.Sc Physics and write UGC-NET and be their JRF or Assistant Professor. You will be paid regularly under this and you also cna study for your research programme.