It's been a while since I've read air law!
This might be a good moment to quickly skim through all your books again, because the exam will include an oral component and since your route takes you through an AIAA, the examiner may want to question you on this specifically.
But this might also be a good moment to get familiar with something called the AIP, where to find an up-to-date copy for each country and its structure. An AIAA is something that's UK specific (although other countries may have the same concept under a different name) and the details/procedures surrounding an AIAA are detailed in the UK AIP.
In this particular case, the ENR 1.1 section of the UK AIP has this to say:
2.2 Area of Intense Air Activity (AIAA) - Airspace within which the intensity of civil and/or military flying is exceptionally high or
where aircraft, either singly or in combination with others, regularly participate in unusual manoeuvres.
2.2.1 Intense civil and/or military air activity takes place within the areas listed in ENR 5.2. Pilots of non-participating aircraft who
are unable to avoid AIAAs are to keep a good lookout and are strongly advised to make use of a radar service if available; these areas
are depicted at ENR 6-5-1-2.