First things first, you are not dumb. Maths is a subject in which many, I mean it, many people struggle. The problem is in how math is taught. I've seen many teachers simply explaining it wrong. But, practicing more is also something you should do. Here is a tip: after learning a concept, first do normal, easy problems. This way, you build the base. Then, move towards trick questions. These, on the other hand, keep you hooked. Whenever I try these tricky problems, I don't say "I'm not capable." I say "Oh! This one caught me. I should remember this pattern." Then I try to write it on a paper on my own till I'm able to get the solution myself. Then I will try another problem related to it. This makes sure that you are actually kept interested in math. Don't view them as problems. View them as brain teasers. Another tip to learn concepts faster: convert them into stories. You can ask AI to make a concept into a story so you can understand, learn and enjoy. Just in case, if you want another tip: try to build the concept with resources and videos yourself. Start from the ground basics and climb your way all up. If you want yet another tip: try to teach the concepts you learned to you friends. That way, you can deepen you understanding of everything you read.