One word (or is it two?? ): Userscripts
Check out this thread:
I’ll let others name names (I don’t actually use them often), but I think there is one that allows you to quiz yourself outside of reviews and you can set it only to test you on certain categories like only n levels, or only vocabulary, etc. Sorry I can’t remember the name.
I’d also recommend taking advantage of the third-party phone applications. I do 95% of my reviews on Tsurukame (Flaming Durtles before I switched to IOS) and I could not live without them.
Especially with school, it’s incredibly helpful to be able to do reviews where ever and whenever.