Need help on AS levels and possibly moving schools

Im currently at college studying my AS levels after just leaving my previous school after GCSE's, however, im considering going back to my old school because im finding the change a bit hard.
Im studying only 3 A levels; law, sociology and textiles (i dropped my 4th which was psychology a couple of weeks before the half term.) However, my old school don't teach law and if i was to go back it would mean having to drop law and do only two A-levels and im completely stuck as to what to do.
i need help on what to do please, any advice is appreciated.