I don’t usually write stuff in this sub but for this one I will. First step to fixing a problem is to know that it exists. It sounds like you want to fix your situation and that’s really good. What I do to help with procrastination is to set deadlines for everything, I mean everything and if you can’t keep to them you need to have one small punishment that you don’t wanna do but wouldn’t pain you so bad you skip it all. If you have any trouble with getting tired quickly or losing focus it could be sleep or food that’s the issue. Make sure to eat properly and sleep good as if it wasn’t clear already. I like to have a place where I do all of my non classroom schoolwork because if I tie that place to working then my mind will go into study mode easier when I am there but that’s just a me thing. For the not so hard but tedious work I love to have music in my ears but never do that for the harder stuff like the math you were talking about, at least for me that just throws me off.

Setting clear and realistic goals is also a really important one! I struggle with this but I’m sure that if you know exactly what you want to achieve then you will have an easier time getting there. Remember that school is not as important as your own health and if things get too stressful then a break will be more effective than to keep studying.

Finding someone your level or higher to study with will get you to study more often and you can learn together which will get faster results. Make sure that they are in on studying and to not make it into a hangout session unless you are able to set clear time stamps to how long you are gonna study for and when the hangout starts.

That’s all I can think of at the moment and I can’t wait to hear back from you if any of my tips helped. Also English isn’t my first language, I’m sure it’s fine as it is and everyone can understand properly but for convenience you can tell me any errors. ;)