I'm in a town- not a lot of big chain food outlets, but a lovely coffee shop and many chip shops as well as a metro-type supermarket, so my perspective might be different from those who're in a bigger city area, but I stayed in for lunch. I took my own food most days, because it was cheaper and also healthier [paninis are great, but not the healthiest everyday!]. There was a variety, though- my group mainly stayed in and got food from the cafe or brought our own, other groups went out more.
Sit next to someone you'll enjoy sitting next to- your work ethic won't be significantly boosted by a smart person, though if you know you just can't work sitting next to a friend who you always talk with it might be wise to move away! I found I had more genuine subject-based discussions, and found some of my most interesting ideas, sitting with friends.
A balance of work and socialising! You'll get a lot of homework, which is overwhelming if you don't use your frees... so review notes and do set tasks, but it's okay to have a few hours a week where you play cards, or sit and talk or whatever- I found this helped me to be more productive in my working frees because I had the others to look forward to! Especially when I had last period Friday free with a large proportion of my friendship group, that was one I allocated as a socialising free so long as I was in a position where my work was manageable
Which exam board will you be? [sorry to jump in, but Psychology <3].
I found Psychology to be my easiest A Level in terms of understanding the content and how to approach exam questions [I also did French & Religious Studies] although it is quite content-heavy, with memorising studies, samples, results and so on... I ended up learning a ridiculous amount of research evidence!
The research evidence aside, the subject is really interesting- with edexcel I studied 5 approaches and key issues like anorexia, genocide and stuff at AS, and then at A2 we did child, criminological & clinical psychology. All of my A2 notes, and 2/3 of my AS notes are online, if you're interested I can link you
The exams for me involved essays of up to 12 marks at AS and 18 marks at A2, but also had multiple choice at AS, they were more like GCSE science exams than extended writing exams?
Is there anything specific you'd like to know?