This is correct.
There is no test called the A1 test.
A1 is the level which must be passed in order to satisfy UKBA.
I would suggest to review the UKBA approved listing and find an approved test centre and provider near to where you live.
Might be a good idea to request information on how long it takes to process the pass certificate. Some members have had to wait a long time.
There's plenty of threads/posts on this subject if you do a quick search.
Good luck