@LeoA1994
http://7sage.com/lesson/logic-games-boards-summary/
http://7sage.com/lesson/logic-games-habits-for-speed-and-accuracy/
These two taken together are fantastic cheat sheets.
You really should have at least two academic if you can. You're not K-JD but you aren't far off so I would say your best bet is two academic LORs and one from your employer.
Also it doesn't matter if the UG prof was in a law related class. Just get the best second academic LOR you can regardless of the area of expertise of the professor, or the class you took with them.