Para aprender mais sobre os Tempos Verbais baixe agora o: Guia Grátis de Tempos Verbais em Inglês.
Ele contém um resumo bem estruturado para revisar os conceitos que você aprendeu na escola.
When it comes to diplomas/certificates, chances are that they express that achievement by something like: "...in recognition of the completion of the course of study [name of the graduate student] has been admitted to the Degree Bachelor of Computer Programming & System Analysis... And is entitled to...
Give uncle Google a stab and take a look at some diploma templates and see. Let´s wait for some improvement or further insights on that one.
To be admitted to that degree would mean that one has studied at undergraduate level (higher education - "curso superior"). Anyway, let´s wait for more sentences and further comments coming from other participants.