I've graduated thanks to not gaming or having any kind of fun during my entire higher education career. No gaming, no social life, nothing. Yeah I know, I'm extreme but hey, at least I got that degree that most of my friends didn't.. and who are struggling to find a job..
There's a nuance though; I would game if I had my stuff done and if I was well-prepared for coming mocks. Was it worth it not gaming? Yes, it was worth it. However, I do have to tell you that I am now getting old and I'm desperately trying to recover the fun times I missed during all those years. Right now I'm forced with my nose into a job I hate. Anyway, I digress. I didn't spend 3 years doing my Bachelor, young one, I spent 6 years.. Yes, the road isn't so easy for some of us.
Don't fall into the trap of binge-gaming and try to stand strong on your two feet when your zombie friends with no self-discipline try to lure you with tempting lines like "come on bro, one more". Yeah, that "one more" can derail into 10 more hours. At some point you just have to call it quits, log off and risk being called an a*hole. You'll do yourself a service.
One good piece of advice: copy successful people, not losers. Guess why? If you copy losers, you'll end up going down their same path and.. I don't think you want that; I'd think you want a good life.
I recommend you don't game during coming mocks for one very important reason: to protect your future. I know what I'm talking about because I've been through that sour place called the real world, where no one respects you unless you've done something to show for it. Focus your time 100% on the mocks and divide your time wisely.
For example, at one point I was at a decision point: I had 3 months to catch up 3 exams: 1) Computer Science 2) English 3) Other languages. For me, 3 months was surely not enough to be well-prepared to pass them, so I asked my counselor for advice and he told me: put the least time into the courses you are pretty good at (English and languages) and focus 90% on the courses you are having great difficulty with (Computer Science). I did so and.. well, I passed all three of them! Great tactic, I must say.
All right, good luck out there and try to do your best, full throttle!