four consecutive attempts rule

I happend to see, after 4 consecutive registration of same subjects and failing them would require you to re-register .

i got this info from ‘myacca’ going under exam status and reports and selecting ‘ERS STATUS NOTES’,under section A
‘You must pass the paper within four consecutive sessions following registration, calculated from the first session you are eligible to sit. Failure to do so will result in you
having to re-register for the Diploma and pay the appropriate fee. If you do not attend a session, it will be counted as one of the four sessions.’

So my questions are two fold :

1.i was able to write the same exam five times …..june 2013 (last attempt) and dint need to re-register
2.what does this mean for my bsc degree grade…if i dont appear in an exam will it AFFECT MY GRADE

thanks in advance