The Bloxburg High School is a cool idea but is frequently underutilized, and often empty in most servers I have been in. This is mainly due to the fact that the grind is way too long. The 20% bonus is cool, but you need to take about 324 classes to get to that point (without utilizing any speedrun tech).

School points are a good idea but quite pointless and you wouldn't ever need to grind for them, which is a shame because music class is significantly more fun than most of the other classes.

To offset this incredibly long grind, I think the classes should last twice as long, and remove the lunch break. It may make the schedule less realistic to real life, but it's really more of a hinderance than anything. If you want to focus on the highschool grind you'll basically end up server hopping.

Along with this, you should be able to keep earning more credits after A+. Most people abuse the fact that you can just leave class and rejoin to get more credits than 10, so this would solve 2 problems. Since the classes would last about 4 minutes, you would be able to rack up a decent amount of credits in that time.

Lastly, you should be able to use your school points for starting "extra credit classes" in the general studies room, triggerable all hours of the day, where you could choose a subject and earn credits for it in a 4 minute class. The room would change based on what you chose to reflect the subject.