MFW Coworker tries guilt tripping me into taking their shift when i have a final for college

Like, I'm sorry but this s**t costs more than a single shift is worth, and missing 30% of anything in a course would get me kicked out of it. The final is worth 40%. Nevermind the gpa drop i'd get, i'd need to take it again.

Doesn't help that I'm covering somebody nearly every week anyways, like, give me a break for my finals please. Already took up a 6 shift week for you all just before the bloody midterms..

dog tax (am i doing this right?)