Bad at chemistry past papers?

Don't worry. Simple trick. Do past papers with the mark schemes (consult them after every question or completely if you cant do it). This will help you memorise the mark schemes and how marks are awarded (very important for exam technique) and will help you get through way more past papers. If you dont understand how they got the answer, check the textbook.

After a few past papers you should be able to start answering without using the mark scheme, so practise doing full papers and then marking them

I've finished my revision now and i am now attempting past papers for chem but ive noticed that i cant seem to answer many of the questions. even when i do, i end up gaining a mark out of 3/4. i dont know whether if i this is a sign of lack of knowledge or what. anyone have any tips to help tackle this- my confidence for chemistry is seriously dropping now.