The A1, A2 and A licence tests are all the same test, just done on different engine sized bikes, each one relates to a full licence for that category of the maximum motorcycle power output, costs do vary depending on the school you train with but the costs of the actual tests are the same, however if you pass a test on an A1 or A2 and you wish to go bigger you would have to take another test for category A or A2 if you passed A1, in principle doing the A would be best but not all riders are able to use the bikes provided for whatever reason, so it is best to find out what bikes are used and try and get to try them with a school