Study Hall:
 

These study hall settings are based on the sum of aspiration plus intelligence. These settings should get most of your players a 2.50 or above. There will always be someone who needs to be bailed out with coaching blocks too, but these numbers shouldn't cause any major disasters.
asp+int - study hall %

200 - 8%
190 - 9
180 - 9
170 - 10
160 - 11
150 - 12
140 - 13
130 - 15
120 - 16
110 - 18
100 - 19
90 - 20
80 - 21
70 - 22
60 - 23
50 - 24
40 - 25
30 - 26
20 - 27
10 - 28
0 - 30