tbh the worse the 6th form the better - bc then you'll get an advantage when applying to uni, just get tuition xD
nah but for real, it really doesn't matter what 6th form you go to
there was a very good 6th form that was one of the top - dont remember what exactly when we applied
and i know people who went there and got average A levels like me - Bs and Cs
and then there were other people who went to my average 6th form who got As and A*s
it doesnt matter where you go, but how hard you work