3 A levels and 1 AS level

Erali2009-_

I am planning on both beginning and ending my A level (CIE) journey this academic year (10th grade). The A level subjects I want to take are Maths, Physics, and Computer Science. Since my country's math and physics subject contents are on par with those of A levels, I think I will be able to manage by simply focusing on past papers instead of kicking off with revision. Sadly, I cannot do the same with CS, as I am absolutely trashed in it and need a lot of both theoretical and practical practice. However, it seems realistically possible get A*A*A in them. I wanted to do Further Maths AS levels to show "academic passion" as well, but the test centre (I'm a private candidate) does not offer it; so I considered doing Chemistry AS levels instead. So I wanted to ask whether it is a good idea to do AS level Chemistry alongside three A levels to show rigor for ivies.