I would recommend spending less time on learning the content, reason being, that it is usually inefficient.
Cut it down to 1 week on content. Start by going through the specification and adressing every single point, making sure you understand it. (This helps more for science subjects.)
Do all the past papers as early as possible, and after each one, note what you didn't understand, and go and learn it.
Then, (and this is crucial) repeat your past papers in the last week. Make sure you get 100% in them the second time round.
Good luck. You can do great!