HELP: Private Science candidate concerned with practicals

I've planned to self-study Biology and Chemistry. I should have no problem getting into a private practical lab. However, my concern is whether I'll be able to register as a private science candidate without any school affiliation. I've been told that private candidates cannot do practicals.
Now, I would like to know if I can give lab practical exams if I register under British Council Bangladesh as a private candidate (with no school affiliation). To be more specific, I'd like to know how if I can add the practical subjects shown below in the cart.

Correct me if I'm wrong but you'll need some school or affiliation in order to sit the exams - without this it is impossible. As for the practicals as long as you complete the ones specified in the specifications, and this can be verified, then it won't be much of an issue.

Would the British Council be considered a school? It has it's own centre number. Usually, private students register under British Council for their exams. But most of them do not take science subjects. I want to know if I'll be able to take practical subjects if I directly register under British Council.

If it has a centre number then I believe this would be okay. Do you have any way of contacting them and clarifying this information?

Have you considered doing a curriculum that does not have practical exams? I assume you're doing CIE but edexcel does not have practical exams

An update: it is possible to give practical lab tests without school affiliation directly under British Council, as it is a centre and has a centre number.