I have a test on Thursday at 4:30pm, I have not been to lecture except for 2 times during the past 5 weeks, which is what the test will cover. If I fail this test I will undoubtedly fail the class(I already am). There is a decent amount of info to cover, but I feel like I can definitely study for it and at least make a C or B. I am prescribed adderall xr 20mg once daily(I take the generic if it matters) and it works wonderfully for my adhd, but I have noticed that it doesn't last the full 12 hours like it used to, its more like 6-8 hours now, which really makes it hard to be motivated to study or finish my work when it wears off. I would like some advice on how to divide my dosages over the next 2 days and beyond, as my refill date is on the 13th, so I only have 8 pills left. I am considering splitting my pills into 10mg dosages, taking them twice daily, but i'm not sure if I will feel the effects or how to ingest it once I break the capsule. I have not abused it ever, and don't ever plan on abusing it because it is so helpful for me and I don't want the doctor to take it away from me, but I really need some help this week. Any advice would be great, please help me. Thank you.