I got 100 in everything once, but that was because I was able to beat the X-ATM092 very quickly (Squall did 7000-8000 damage with trigger (with punishment)) and battled it only twice (when you have to at first, and on the bridge, where I destroyed it) so I got 100 in everything and 100 bonus, and the maximum SeeD level that can be obtained is 10, so destroying the X-ATM092 just compensates for 100 pts.

Battles with the X-ATM092 can take a lot of time, so train Squall a lot before the exam, and make sure he can do at least 4000 damage so you can run away quickly.

Otherwise, it's worth being a few minutes late to get the 100 pt. bonus.