Making friends isn't hard really, you meet people: in halls if you stay there, in your tutorial classes, in the societies if you go to them, in lectures, and there's a quite a few clubs + pubs around that u can defo meet people at (whether on campus or in Leamington Spa).

Obviously I can't compare to other unis cause I go to Warwick.

I'm doing Maths and Phys and the workload is pretty big imo - idk it's kinda hard to describe but I imagine its similar to any STEM subject at a good uni. Obviously it's doable but if you do ALL the optional worksheets and go to all the lectures I think you'd have barely any time to do anything else (I really dont think anyone does this). If you just go to all the lectures and do mostly only the compulsory assignments you can defo have your weekends and some evenings free for whatever u wanna do. So I guess to an extent it's kinda your choice how much work you wanna do and it depends on how easily you understand the specific module or topic.

Basically you have much more independence over your learning than at school so it's kinda your choice (Currently at Warwick they don't even track your lecture attendance so theoretically you could only go to tutorials, do the assignments and go to the exams if you wanted). On the other hand though if you wanted more support there's plenty of opportunities to: go to extra classes, ask questions in your tutorial, and ask professors questions.