does the rules for the saorbriathar change if it is a briathar neimhrealta like clois/beir etc
Kinda. They're all different like:
See how dúirt mé - I said
Dúradh - Was said (no "i" or "t")
Deirim - I say
Deirtear - Is said (follows the rule, just an irregular stem, deir)
Déarfaidh mé - I will say
Déarfar - Will say (again follows the rule, just an irregular stem, déar)
I'd advise you to learn off the Aimsir Chaite briathra neamhrialta saorbhriathar because some are very irregular, see:
Dúradh - abair
Rugadh - beir
Bhíothas - bí
Chualathas - clois
Well with a little practice, I can get the grammar rules and briathra neamhrialta stuck like glue into your brain
Just drop it. Or deliberately fail a dyslexia exam....
It's actually very easy benkealy. I was once so stressed and sick and tired of Irish. But now thanks to all my study, now I find it an exceptionally easy subject / exam. It is one of the few I am totally not worried about including with English, Music and History.
Though some have spelling mistakes such as:
Déarfar (has a fada on the first "a" in this link)
It will help you very good!