English Literature and French, CIE or OTHERS?Watch
P.S. I'm also taking math, history, psychology, and economics in school, all for CIE. Would it be better if all my grades are from the CIE exam?
If you're self-teaching, it's better to go for the most popular boards where are the most resources - so AQA or Edexcel. I should warn you, though, 3 A levels is quite enough and you will likely struggle to get through 6, especially with Eng Lit and French as your self-taught subjects, as so much is about exam technique and so little about actual content. I study English lit, French and History, and it is a lot of work even with 3.