Thanks all for the feedback. Very helpful.
One last thing from me, which is THE most common mistake by all candidates (me included) is underestimating the theory.
Up to ICD Theory exams should have been a breeze, there's nothing difficult. At IDC because there is so much to do - lots of time spent on presenting lessons, your practice exams are only to let you know your weaknesses rather than teaching you from scratch, so you really need to already be scoring pass marks in practice. If you're really poor you won't get submitted to IDC (that's how shops keep their IE pass rate up)
There are 2 exams Standards and Diver Theory
Standards is easy it's open book, you're allowed an electronic device (not connected to the internet) where you can quickly word/phrase search the manual.
Theory some basic stuff, some things like tables, you may not be familiar with, some stuff you've forgotten or not even come across
At IE the Theory exams are (generally) first. You're greeted by a welcome slide telling you to relax and enjoy it - yeah right!
The dive theory is split into 4 or 5 sections, where you need to get the minimum pass mark in each. IIRC there are only 12-15 questions per section which means you are only allowed 3 incorrect answers. You need to pass each section
Quite a few good candidates fail this. Either through nerves, silly mistakes, simply not knowing tables etc.
You will have never seen the questions before (similar yes but not the wording nor the answers) and especially on tables, 2 answers are very close, meaning you really do need to calculate them correctly or be a very lucky guesser
If you fail theory, you still get to continue IE, but you know you can't pass at the end (go back to another IE and re-sit the failed exam). Some candidates pick themselves up and complete the rest of IE well (but are gutted at the end when others are getting "The Handshake" and they're not), others fall apart and have a bad IE, which adds pressure to the their next one (if they choose to continue)
There are lots of online resources available, so my advice to you as I tell others, get on with the theory now. Whenever you decide to progress having that part sorted early makes the whole process easier and more enjoyable.
I'm currently revising all theory ready for Staff instructor exams which have a higher pass mark. It's amazing what you forget.....