Past papers are legit your Quraan. They are very very very important; with them, you're guaranteed a 50%.

Practice the questions frequently, and with that, you will be familiar with the questions asked and the answers the examiner requires for you to write.

The marking scheme contains the keywords which you are supposed to write to gain marks.

1) Extreme papers (https://papers.xtremepapers.xyz/)

2) Cambridge International (https://www.cambridgeinternational.org/)

3) Teachifyme (http://www.teachifyme.com/)

4) Papa Cambridge (https://papacambridge.com/)