My college tutor thinks I’m wasting my money paying for my exams

If I understand you correctly, you do want to resit GCSE English Language and Mathematics, but don't want to do so in the resit class at college?

Instead, you would prefer to take the Edexcel IGCSE specifications. The point is, though, you can't take those specs at a publicly funded college in Wales; WJEC-CBAC is the only game in town.

But you say the college won't let you resit anyway because of your F and G grades. You say you're confused, and so am I!

What exactly is your question, please? More to the point, what are you studying in college at the moment?

Why does your teacher say non WJEC exam board exams are a waste of time? I don’t understand

Ok I didn’t know what an IGCSE was but now I do. They are internationally recognised qualifications that uni’s recognise and you can move on to A Levels with them.. so, perhaps your teacher is saying that they don’t feel that you will be able to engage with them without a lot of support given your current grades?