For any type of Year 11 GCSE additional science mocks, they are 90% likely to be using the June 2014 papers; I got the June 2014 paper on Tuesday.
Your request for us to 'Help' also implies that you don't feel prepared and the paper is a safe bet for you.
No one, apart from teachers have the paper. So you're out of luck, best best is to revise, and don't use TSR to obtain secure papers. A lot of questions are fairly straightforward, and if you've done adequate revision, you will be fine.