After 12th, if you have interest in engineering then there is a lot scope for IITs , NITs
For this , you have to give entrance exams like JEE main and JEE Advanced.
Also there is option for private institute like BITs and VIT.
If you interest in pure science then you can do Bsc with subjects like Physics, chemistry, mathematics and chance to do PhD in that.
Better luck for your future!!!