Unequal Estimated Taxes? And a million other questions about driving with UberEats

I know I'm about to ask a lot of questions, but I'm brand-new to this so I could use all the help I can get. I'm a full-time college student and have just started driving with Uber Eats also. I see that Quickbooks estimates quarterly taxes, but my income will change a lot throughout the year depending on my school schedule. For example, I'll work less during finals and more during breaks.

Can I just look at what I made during that quarter at the end to pay taxes based off of that, and do that every quarter?

Is there anything else I need to do to explain why my quarterly taxes would be different each quarter?

Can I just pay what I owe at the end of each month instead of waiting for the next quarter?

Are there any forms I need to fill out to do this?

Also- are quarterly taxes only for self-employment money earned? Because last year I got a bit more in scholarships than my tuition was and I had to pay taxes on my scholarships and grants, too. Does this need to be factored into the quarterly payments? If so, I'm not sure how I would even do that because I don't know what my financial aid situation will be like come August.

If I change jobs and stop driving with UberEats mid-way through the year, would I still have to pay quarterly taxes for the end of the year or do anything to explain why I'm not paying quarterly taxes after quitting?

Do I need to do anything like quarterly payments for state taxes? I live in West Virginia.