Thinking about quiting my job

Should I stay or should I go now?
If I go there will be trouble,
If I stay there will be double...
lol
OK so call me crazy, but I'm strongly thinking of quitting my job. I don't know how the whole CNA training process works though, and what if I fail! Heck this is only CNA classes, how am I going to do it when I start nursing school next fall (if I get in, I’ll probably have a lot of prerequisite first)?

So far my schedule will be as follows:
Monday: School 5p-10p
Tuesday: School 5p-10p
Wednesday: work 9am-Close(around 12am)
Thursday: School 5p-10p
Friday: work 10-close (around 10pm)
Saturday: work 10-close (around 10pm)
Sunday: work 10-close (around 12am)
(ps I get around 2 hour breaks for doubles at work)
Plus in mid october I start cliniclas every Saturday and Sunday 7am-3pm and then I'd work 5p-close(between 10p-12am)

Just looking at that schedule and knowing I won't have a day off until Thanksgiving and then again until I graduate in December (if I graduate), all I can see is burnout. I don't know how people do this stuff with kids too.

Luckily, I save money, have been for years - until of course I got an apartment and had bills, suddenly my $11,000+ bank account depleted.
Dad let me move back in with him recently and is so happy I've decided to go to school. He's letting me live there free of charge.
I still have the following bills to worry about:
cell phone
GAS
car payments
car insurance
and groceries

I’ve figured out the money issue and how much money I have in the bank now, plus the CD that I will get on my 22nd bday in December, and the money my bf owes me (he just got a huge raise so he’ll be able to get that to me soon).
I have probably 14 weeks to go without income (but I don’t know exactly, how long after finishing the CNA class do we take the test, find out we passed and can start working???). If I stay on a strict budget using the money in my bank I can still come out with - Ironically, more money than I have available to me now (because of the CD). Not much, but enough. There won’t be any Christmas presents this year but everyone knows I’ll be in school and don’t care.
So my plan can work.
BUT
What about next year? All the costs for prerequisite and books and classes...
I’ll hopefully be working as a CNA then, and hopefully be making just a little more than what I’m making now ($10.50 an hour as a line cook).
According to the website, the classes alone will add up to $6,700 (for 4 semesters) that is a lot for me, but doesn’t seem like much at all for college classes (then again it is the cheapest community college in the state). Room rates are $1,340 per semester, but I’d rather live for free at home than share a room and shower with strangers.
I don’t know how financial aide or loans or grants work, and I heard hospitals will sponsor you, like the LTC is sponsoring my class now. But do they pay for everything, or just the nursing classes?

I’m feeling a little overwhelmed and it hasn’t even started yet.
Should I give my 2 weeks notice?
~Michelle