Sorry, I do not really have any great tips.
I think one of the troubles is that maths classes are often too hard.
If something appears to be unachievable it cannot be fun.
Try to concentrate on the basics. Get success with those. Build up your confidence.
If you had a worthwhile tutor that is how they would be helping you to achieve. Building confidence works wonders for ultimate success. Without proper guidance, I expect this will be difficult for you to achieve so that is why I said I really do not have any great tips for you. But maybe it will give you something useful to think about.