Am a regular on here - usual NN has something in common with the Man Who Fell to Earth (please don't out me)
Have just started Part 1 of my IPSEA training to become a tribunal rep. Have spent the evening going through the first module - it does look good and very thorough with thought-provoking multiple choice questions to ensure you have a thorough understanding of SEN law.
A lot of online resources - including full law, statutory regulations and guidance notes. So a tremendous amount of reading and digesting.
I think the modules the reps go through are similar (if not the same?) as the modules parents would take. If this is true, then it'll give you excellent grounding to be able to fight for your dc.
There is a tremendous amount of information there but I recognise a lot of it from my own battles with my LA. So you wouldn't be going into doing the modules blind from a standing start - you'd have your own experiences to draw upon. If I was going in cold, it would floor me but as I've spent the last few years reading in minute detail the Ed Act and SEN CoP (and Mumsnet!), I'm going in with the mentality that it can't be too hard to understand! After all, at Tribunal, I understood all the laws and regs much much more than the LA did!
I have literally only started tonight, so maybe ask me again in a few weeks when I've got into the swing of it!