help inglese!?

I'm currently studying German with a private tutor (teacher) however I will (I'll) be attending an official course in July at the Universita' Popolare di Roma. I have attached a document verifying this, for your perusal. I do not currently possess a certificate (German language certificate?) however I will be endeavouring to learn the German language to the best of my ability before September.

Alcune note:

"currently studying": cioe' lo stai studiando correntemente/al momento

"I will" perche' e' una cosa sicura nel futuro, cioe' sei gia' iscritta

"verifying this, for your perusal": Per la vostra informazione ho allegato un documento che verifica/evidenza....

"endeavouring to learn to the best of my ability": tentero'; cerchero'; mi sforzero', cioe' mi e' sembrato che tu faresti del tutto per imparare il tedesco e questa frase rende questa idea tua di usare tutte le tue abilita'/capacita'

I'm studying German with a private teacher and I'm going to attend an official course in July at the Università Popolare in Rome (I enclose the related documentation). At the moment I don't have a certificate but I'll do everything possible to learn as much German as I can by September.

I am studying German with a private teacher and I will attend a course at the Popolare University in Rome in July, whose I have enclosed a document. At the moment I haven't got any certificate, but I will do my best to learn German within September.

I'm studying German with a tutor and I'll attend an official course in July at the People's University of Rome, which I attached a document. I did not at the time a certificate, but I will do everything possible to learn German best I can by September.

I'm studing German with a privat teacher and i'm going to attend (perchè indica intrenzione quindi è preferibile a will) an official cours in July at the University Popolare in Rome, whose I've enclosed you a document.

at the moment I've got no certificates, but I'll do my best studing German by September (spesso può ingannare la differenza tra by e until anche se sono solo sottigliezze; by indica entro tale data ed una cosa certa, until entro sempre, ma più generico, non sicuro)

I study German with a private teacher and I'll attend an official course in July at the Università Popolare di Roma, of which I send you a document. In this moment I don't have a certificate, but I do my best to study German very well within september.

Ma non ci metterei la firma...Dovrebbe essere così

Inglesina ha la risposta migliore, soltanto che c'e' bisogno cambiare "enclose" a "enclosed" perche' bisogna usare il passato in questo caso.