When I was in class Xi , I wonder seeing a doctor.It seems almost impossible.Its been five years from then ,I'm a final year MBBS student at CMC ,oldest medical College in whole Asia . It took me 2 years of labour,dedication , sleepless night and self confidence.I have continued my board and medical preparation simultaneously.I didn't join a coaching centre to save my time ,read NCERT text books repeatedly and practised MTG aipmt guide mcqs and eventually got a lot common.During Exam , I kept my brain cool ,tried avoid darkening the area where I got confused.So, don't worry I advise you to
(a) read NCERT text Books thoroughly and point out the queries
(b) practise a decent mcq book
(c) read a books for explanation preferably MTG rapid biology , Arihant organic chemistry ,Physics D.C Pandey ..
Best Of Luck