Join regular coachin in your home town. Correspondance think of Fitjee/Narayana. MTG's PCMB today is good, subscribe if you want, question papers from various exams are available in it. But remember one thing in mind, whatever course you join you have to work hard. You have to decide time schedule right now , strictly follow study schedule. Basic concepts must be clear by the end of first year, practice papers topic wise in first three months of second year, test series afterwards , followed by review where you went wrong.

Best wishes.