Best advice: start now. Like now. No, I mean NOW. Even if it's one line. One key-term.
Build it up. Make some sort of timetable. Kick all that short-term knowledge and lodge it into long-term storage and this can only be done by dividing into bite-sized chunks of info.
Start with 20mins of study on one topic. One specific topic. Doing a little bit everyday and going over what you've done after a week, a fortnight, a month will consolidate it. Revisit = moneyyy
Eventually you could realistically get into a 45min study then 15min break cycle for a few hrs at a time.
Once Easter comes around, you wanna have done most of your content and started past papers. THEY WILL GET YOU THE GRADE.
'nuff said.