I have just passed 12th with 52%

Hey sayali
Nether your boards nor your NEET exam went well so it requires proper planning so that things can get proper . First try to get into some college to do bsc (as you have mentioned ) if the college admissions doesn't requires 55% marks .However you should apply for the Improvement exams to increase your boards percentage .You can do both of them altogether but requires hard work .Also try to take admissions in courses which requires less hard work and there should be less competition for that
Comment below if you want any help
Best of luck