Congratulations on becoming one of those exclusive breeds of Ex-RAF engineers! You are doing the right thing in gaining your B1, pay is pretty rubbish as an unlicensed mechanic in the civil world. Some companies will help you out if you are prepared to put in the effort yourself. BMI used to pay your exam fees if you passed and Virgin have in house training for both "A" and "B" Licence's and they will also pay your exam fees if you pass through CAA.
Modules: I have found that each module is as easy as the amount of work you put in! The 66 club site has been an excellent sourse of revision for me, (only 2 more modules to go!) and it does give you an excellent insight as to the exam format. The maths is fairly easy stuff, and with a bit of revision it soon comes back. Try looking at a basic GCSE Maths book, that will give you the right level to pitch your revision at.
Jobs: If you are in easy reach of Heathrow, try the BMI hangar. They look favourable on ex-RAF people, especially with wide bodied experience. Worked for me and I was ex VC10. Money's not good but it might get you a foot in the door. They have the Cathy Pacific contract during the day and they service their own jets at night. Hope this helps.