Alex,
How are you getting on with Thom? I was using Pratt, but have now gone over to reading Pooleys as I personally find them much more user friendly with clearer explanations.
I use Airquiz which is good, but I am finding now that the questions on there are harder than the real thing and bizarrely, I have been getting fails or scrape passes on that...then do the real thing and pass with flying colours!
I find the best test questons to use are in the PPL Perfector as theya re real CAA questions. I have now passed Met, Air Law, Comms written and Aircraft Tech by brushing up with that...and lets just say, I now find it an indespensible publication