Mate I know exactly what you mean - my mid-term memory was completely shot to pieces for a good 12 months after propecia. I was a few years ahead of you (coming up to fourth year of practice) and it became very obvious to those around me. I only really kept my job due to the crazy hours I was willing to put in to compensate.
Law is so marks dependent that it might be good just to do as well as you can this semester, take some time off and maybe start chipping away at those student loans. If you’re in the US, the market is god awful right now so you shouldn’t be in any hurry to graduate.
Know that mental effects almost universally get better within 2 years. I’m almost back to 100% at 22 months off. I would give omega 3 fish oil a crack (did nothing for me, but others found it helped) and eat a high protein diet (protein for each meal). Eating a healthy protein filled breakfast was a great help for me.
PM me if you’re still fucked up.