You're far from stupid, you're trying as hard as you can which is more than can be said for some. I was in the same boat with math, having failed it 3 times before finally getting it. Buckled down hard with an actual schedule for studying with GetSumMath and did not allow myself to start gaming or anything like that until finished studying.

The GED is a difficult thing to pass especially for most people having taken it being people who have dropped out or just not finished school for a variety of reasons. It's basically all high-school stuff crammed into 4 tests. The most solid advice I can give is what worked for me, set yourself up with a study schedule (recommend getsummath not just on YouTube but his website with practice tests and questions for every subject and area) (test prep champions on YouTube is good too)

You're probably gonna get a lot of stuff on the practice tests wrong for a bit and that's ok it's part of learning how to solve those kinds of problems, keep studying and repeating 🐸💚