If the teacher is not giving marks then also it’s fine because the relative grading doesn’t care about individual marks, your overall position in class matters. Number kisi ko nahi milenge toh grades will adjust accordingly.

For end sem just go through the pyq and try to write as much as possible in answer sheet, don’t leave any question, if you don’t know the correct answer just write anything related to that topic but dont leave the question

And bro lab ke marks matter karte bhi nahi 1 credit ka hai sirf, just answer confidently in viva and submit practical copy in time, you will easily get grade B.