Weather:
Head over to the met office website -
Met Office: Weather then "Services for Aviation". Get yourself an account (free), login and you can check TAF/METAR info there. Have a look at form 215 which will give you an overview of expected weather too. You may also want to look at form 214 which gives winds aloft (although this only becomes important when you start doing nav).
Learning theory:
Along with good reading material, I suggest something like
http://www.pplquiz.co.uk/
You may know all the theory but it's a good idea to get a feel for the way questions are asked in the exams. PPL confuser is another IIRC.
Good luck.