Assuming all your exams are in date and will remain so until you complete, then get the licence application form filled out and the examiner to sign for the exams on the form. If you have done the QXC you will need the QXC certificate and PLOG for that flight as these go with the application to the CAA. Take your training notes or have a copy to take to your new school. Check the stall/spin awareness training has been signed off in your log book. If you have already done the R/T written then get that from completed as well and get the exam signed off, if the R/T practical is also complete get the whole form ready.
No need to take the exams again unless they have run out of validity.