When I'd get in those moods, my only way out of them was to set myself specific mandatory study obligations (note I called them “obligations”, not “goals”). So, I'd figure out how many study sessions and of what length I had left, then break down my study into the amounts that needed to happen at each study session. For example… Sounds like you're thinking you should be studying after work, so let's say that one night a week you have a night out with friends, and one night a week you have exercise, so you think you should be studying 3 nights a week after work, and you want to finish your review of the book by the end of next week so that you have the following week for MCQs. You'll study Saturday for 5 hours around housework, but none Sunday cause you're going to the beach (I know, too early in the season for the beach, but I can dream!). So, 3 hours a night x 6 nights + 5 hours on Saturday = 23 hours to get through the book. I'd then look through the book and count up how many pages of reading remain, divide it by the 23 hours of studying, and multiple that pages-per-hour by 3 for every night's study requirement, and by 5 for Saturday's study requirement. Then I'd chart out what page I was currently on and what page number that meant I needed to be on each day.
Having such a specific schedule and knowing what was on-time and what was behind was the only thing that could keep me on schedule when I was in that mood. Of course, your results may vary. 🙂 I'm getting into a similar mood at work currently, overwhelmed by all that must be done (I'm in private, but our busy time is starting) and not sure how to find the way up – trying to figure out how to modify my study method to apply here. (Having employees coming to me with questions and interruptions, and a ringing phone, and an email inbox, makes it a bit harder to apply in the work place…)