As others have pointed out there isn't anything very important in them anyway
If you were involved in an accident the AAIB might well call for records of your training, so they should be an accurate record of all training given and the standard achieved. Students should be asked to sign all such records to verify that they have been debriefed on their performance. If for any reason you change training providers, then the school must provide a copy of your Training Records as part of a formal handover. An Examiner can ask for the records prior to conducting a Skill Test.
If a school will not allow you to see your records then its highly probably their records are inadequate.