Hi, I have just started this course too and just completed the English and passed. It does sound quite complex at first but if you look at the course material it does explain the passive voice. Are you doing this via distance learning (like me)? When speaking in a passive voice the subject of the writing is mentioned last ie. The Man crashed his car. The passive voice would be, The car was crashed by the Man. If writting a report in the passive voice which i think you also have to do, you just write it as though you are a witness or in the third person. I was terrified when i first read the assessment but realy it is quite straight forward. Wait till you get to the level 3 stuff!!
If your still not sure just speak to your tutor, i'm sure they can explain it better. As my tutor said to me 'don't panic you will pass'.

Kind Regards
Jayne