I'd say about 3, max 4. If your doing 13 GCSEs and can handle that workload well, you should be fine.
If you are also doing 4 AS Levels, which drops to 3 A2s then I'm sure that you will be fine.
With AS + A2, you see that there is a lot of content, but it is mostly how much depth there is in the topics, and how to answer exam questions properly.
I did 8 GCSEs and 3 BTECs, and I do 4 AS Levels now (Bio, Chem, Maths and Politics) and I find it a bit daunting but I think that's more to do with COVID than my subjects.
Also, with your AL choices, it is mostly social sceinces, so background reading and being interested in content is more important, as well as a good memory for recall.