It's not at all clear whether you're just starting to think about this (with a week to go before the exam?) or whether you're looking for last-minute tips. I'm going to assume the former (because I don't know anything about Adderall) and say this: if you haven't studied for the LSAT, then you shouldn't take it. It's that simple.
And when it comes to the LSAT, studying means taking practice exams like it's your full-time job for months. That's honestly what it takes. You can't possibly wing it. And even though you can take it again -- as many times as you want to, in fact -- a low score doesn't just disappear. When I took it (late '90s), I took a leave of absence from work, took Princeton Review, studied all summer in preparation for the fall exam, and then delayed until the winter exam in order to study an extra couple of months. There's absolutely zero point in taking it just to get it over with. It doesn't work that way, and you'll destroy your chances of being admitted to a law school that's worth paying for.
The LSAT ... it really is that serious and that difficult. I don't remember much of anything from law school or the bar exam. But I remember the LSAT like it was yesterday.