First-year student with small questions

As a first-year student, please bear with me as I have so many little questions that I need answers (mostly due to my anxiety);

- If midterms in my class, will there only be one instructor/professor monitoring the whole class? this is out of curiosity because some of my classes are hundreds of students, the seats behind are higher than the ones in the front, not sure how they can be sure it’s fair for everyone.

- If midterms are in designated rooms for online classes, how will I know where my seat is? Are only transparent water bottles allowed?

- For all exams, do you find that you need all 2 or 3 hours to finish them or usually people handover sooner?

-If I have two exams at the same day, what is a good spot to have light lunch/nap/review before test?

-Is there any map showing all the spots that I can refill my water bottles? I saw some taps that are so low, I guess it’s just for drinking directly.

-Will having back-to-back classes a disadvantage during midterm? i.e: I have class A and B on Monday, then class B again on Tuesday so if both of them have midterm falling on the same day, is it even allowed?

- Anyone using CSAS service? I heard they used to help with exams and have mockups but not anymore. When asked I was given general answer (learning and writing), and I’m not sure if anyone has positive experience.