Whatever work you do on operational aircraft, record it all in a Log Book, try to keep the different aircraft in their own sections and state what done even if you only watched it being worked, cross ref your work to the relavent AMM, type of work: routine/defect/inspection etc and if you can, get it verrified by an LAE.I know it sounds a lot, but there is no substitute for an accurately recorded Log Book.If you cannot get a Company one, the CAA at Gatwick should be able to supply one.NEVER give up....it can be done and is a great( sometimes you wonder!) job.Take your time with the EASA exams, THERE IS NO substitute for hard "hands on" experience, hope this helps.Good Luck.