Saw your posting & thought I’d say don’t give up, hang in there! Maybe try and attempt only 1 or 2 papers at a time so you can concentrate on them instead. And definitely attempt some past papers under exam conditions and then grade yourself using the marking scheme, it really works! Good Luck!
Saw your message and you sound so disheartened so I thought I’d say hang in there & don’t despair! Do Not give up… you can do it, just follow the syllabus and do some past papers under exam condition & you’ll nail it next time. Good Luck!