Hey ayrtonsenna, if you read the BA site it gives you the details on how to get this certificate. you have to contact NAIRC and pay for a cert.
i got this cert recently, i did not have it on time to attend the FTE assessment, but BA said i can hand it in at the next stage if i am successful.
It came back and said
An A level = Higher level leaving cert subjects
A GCSE = Ordinary level subjects
So if you have honors in Irish, English, Math’s, History and did ordinary level physics and chemistry then you have 4 a levels and 2 GCSE's.
So an A in Higher level Math’s is = to an A level "A" grade.
Unfortunately this post is not good enough to hand into BA so i suggest you go back on the BA site, find the link to NAIRC and send them some money and then you will get the certificate back.