For the Mod 2 case studies test I would definately recommend drivingtheory4all.co.uk
They have recently updated their Initial CPC section and now provide 60 example case studies, many based on the actual questions the DSA ask. They have built this collection up over the 3 years the Mod 2 has been about.
For the Mod 4 practical exam phone about your local training companies. Make sure you use one that has a load securing demo trolley. The training should last around 2 hours although I know of some trainers that merely hand you the questions and tell you to learn them yourself (not a great idea)
As stated earlier you dont need a school for Mod 2. You can book the test yourself online. You should be able to get the Mod 4 training and test for about £150
Good luck with the training.