How do I improve my spelling and writing

I've struggled with dyslexia since I was younger but I never cared that much about my grades anyways so I chose to ignore it but now I really need to lock in but I do mostly essay based subjects with lots of writing and because of my dyslexia I can barely manage to write the things I wanted in the correct order of you know what I mean plus my brain is so disorganised and not to mention the insane amount of spelling errors, even when I am spelling things right it looks wrong to me can I do anything to work on this or am I cooked