So basically my school grades based on every term, like march, june, sept, and oct. My grades have slipped quite a lot due to the huge jump in difficulty in the syllabus, and while they weren’t perfect before, now they’re even worse lol. I got accepted with an average of b’s and c’s but now im kind of failing many subjects 
i know its quite serious and my offer might get revoked but i just want to get your opinions on how bad it is, and whats the chance of my offer being revoked, thankyou!!
If you get multiple D’s and F’s, then yes it is a huge red flag, and your acceptance might be subject to being rescinded. Try to keep within the C range.
I’d go even further and say if you get one D as a year-end average, you will be rescinded most likely. You may get a break if you have more than one D in a particular term, but the year-end average is a C.
You said you were accepted when you had mostly B’s and C’s, but do you think they would’ve accepted you even if you had mostly D’s? I mean, if the school is struggling to fill their classes with full pay students, you may get by. To be on the safe side though, you should try to catch up. No one can tell you with certainty wherher your offer would be rescinded with significant grade sliding after admission.