Just wanted to touch on the OP's question. I'm an M2 and this is what I've done so far. I bought a 3 (or was it 4) month Kaplan QBank at the end of August which I plan to use during 1st semester. I'm strictly using this in Tutor mode and doing the questions while I have FA open in front of me. Also, I'm choosing the subjects based on what we are learning in class. If a class just started, doing some of the questions for that subject seems pointless, so I try and complete some of the questions for M1 classes. For example, we started Micro. at the beginning of this month. Instead of doing the Micro. questions, I actually took some time on the weekend (maybe 4-5 hours spread over Fri., Sat., Sun.) to complete all 46 Embryology questions in the QBank. I read all the explanations and jotted the "reKap" notes in my FA.
Our Micro. class will be over in two weeks and we are taking a Shelf exam on our last day that counts for our grade. So, for these next two weeks, I'm going to start (and hopefully finish) all the Micro. questions in the QBank (263, I believe). I think I've learned enough material so I won't be guessing on every question. I'll have FA out and add notes to it as needed.
So that's the plan for THIS semester: follow along in class w/QBank and try to do as many other questions as I can during Winter Break so I don't totally waste my money. For 2nd semester, I'm taking the advice of our M3's and SDN and buying a 6 month UWorld, which I hope to complete twice (once during the semester and once during my study month). Will I be able to do everything? Probably not, but at least I have some sort of plan (although I still need to add/remove/change parts of it) so I can hopefully stay on track. I hope this helps.