If you are in Year 11, this is the last full term and it is only 5 weeks long - yes 5 WEEKS! That means you have 15 GCSE Geography and/or History lessons left and 5 RS lessons. It isn't much, so you need to make sure you are doing an adequate amount of revision at home.
Using past exam papers is a good idea. Examples can be found at the exam board websites. Ones for GCSE Geography can be found via the link on the left hand side of this page. Print them off and have a crack at some. There is no subsitite for revision. No-one else will do it for you. If you don't revise, you will not get the grade you are capable of - simple as that.
Take advantage of after-school revision sessions and the materials available online. Keep checking the blog, especially after the May break, for updates