You are on a website that provides free notes, accompanied by online lectures. That said, don’t be disheartened. Failing an exam is not something that should hinder further studies, it should only make you try harder.
Go through the examiner comments for your paper. See if you can identify where you could have gone wrong. Tackle your problem areas. Get help if you get stuck on something. Practice, practice, practice.
I gave some tips on one of the posts, here is the link: