whatever you took in the previous semester will accumulate. the cumulative graduate point average (CGPA). so if you did very badly for one subject, like  C or D, it will show your in CGPA. unless you retake (remember, it's not resit an exam) that class and score a better grade it will be hard to bring your CGPA up.

are you studying there? you seem to know alot.

well, you are wrong.

it is obvious that the studying and exam methods are different, but it still requires memorization. although grades are calculated comprehensively, from the start of the sem/quarter to the end of it, the final exam still carry a lot of weight.

and whatever you learn in organic chem I will be needed in organic chem II, III so on and so forth too. there's no such thing as learn and forget.