To exercise further, here are some great past paper link sources:
https://pastpapers.co/cie/?dir=IGCSE%2FScience-Combined-0653
https://papacambridge.com/cie/sy-qp-ms/igcse/science-co-ordinated-0654/
https://www.physicsandmathstutor.com/past-papers/gcse-science/
https://www.cienotes.com/igcse-science-combined-past-papers/
https://papers.gceguide.com/IGCSE/Science%20-%20Combined%20(0653)/
This is an example of a past paper question and a marking scheme. Having seen this, you then will understand why having an effective study method using key words is essential in order to pass the exam with high scores.