A category A certifying licence permits the holder to issue certificates of release to service following minor scheduled line maintenance and simple defect rectification within the limits of tasks specifically endorsed on the authorisation. The certification privileges are restricted to work that the authorisation holder has personally performed in a Part-145 organisation.
In otherwords you have no certification privileges. Once you have the licence you then do the approved training at the airline, then what you can sign for is in the componay manual. i.e. wheel change, lamp etc
You can not certify anything other than work you have carried out, been trained for and authorised for.