you need above 80 at AS and above 90 at A2 to be able to get an A*. If your average comes out to above 90 after combining AS and A2, that's an A*
happy birthday!
haha good luck!
Actually it's different for Cie. Even if you don't get above 90 ums for a2, if your combined as and a2 scores are high enough, you could get an a* if the overall score is above 90.