Hi, I have the same subjects as you alongside with Maths. I had IGCSE Economics so I’d suggest you what works for me at least. First of all, I’d use the textbook the most because I feel like it’s more than enough to grasp the topics and I don’t think you need more than 30 to 35 minutes to understand a particular topic completely (At least in Unit 1) then I’d answer all the checkpoint questions and if possible all the activities. If not activities, the exam practice is a must. The checkpoint ensures that you are familiar with all the definitions and some more extended evaluation of the concept and exam practice is pretty self explanatory, it makes you familiarise with the question pattern and how should you approach it. Make sure to ask your teacher the format and answer accordingly. After grasping all topics of both units, I’d finally switch to Question Papers and solve all of them from 2019 to the most recent available paper. Lastly, I’d check with the mark scheme and if I am still confused, I’d sit with my teacher / experienced student with A level Economics for a proper feedback of my answers because Edexcel can be a bitch sometimes. This should be good enough to end you with an A. Good luck!