Which exam board is it? Look online for past paper questions and the mark sheet to know how they phrase things and key words they use.
Also learn that when they say "explain" or "describe" they are looking for 2 different answers or it was for AQA.
The examiner's report which accompanies the past paper tells you where students performed well and where they didn't.
I highly recommend Primrose Kitten maths and science on YouTube, she does AQA, EdExcel and OCR. Also a less fun to watch but informative is free science lessons
Ds1 got 9s for science.
If it helps look back over her paper and identify where she went wrong using this MARCKS system (works for all science papers) so write down next to each incorrect answer the reason why was it...
M - maths Did you make a mistake in your maths?
A - Application of knowledge - You know and understand the content but couldn’t apply it to foreign situation/this question
R - Read the question - Did you miss a key term such as explain rather than describe because of how you interpreted the question but ultimately you have the knowledge and understand the topic
C - Communication - You understood the application but the wording you used to communicate didn’t get the marks. Could be specific terminology especially in biology
K - Knowledge - Is your knowledge weak? Do you understand the concept?
S - Statements - If it’s 4 marks but you wrote 2 points and you can see that even though you filled all the lines you were lacking in points
That system came from UnJaded Jade on YouTube who is an amazing StudyTuber promoting revision.