hey i was wondering what the requirements to get a TA job in math 1zb3 are. do i need an A- in just 1zb3 or i need an A- in 1za3,1zb3 and 1zc3.

I'm pretty sure you need to be an upper year student to TA, most are grad students and undergrads get whatever is left over.

okay. but do i need an A- in just one or all the three math courses

That I don't know, you'd have to speak to a someone in the math department.

There's a detailed FAQ on the math website. It's easily found using google.