When is he planning on taking the test?
He needs to get the LRB and LGB, and work through them slowly and diligently, doing some every day. If he had issues with reading comp, he needs to start reading more challenging material to help with his speed and comprehension.
Maybe do a practice test every 2 weeks or something while he's working through the Bibles to track his progress. Each time he takes a test, he really needs to sit down and review it afterwards. Figure out what ?s he's getting wrong, why he got them wrong. Really work on this. He needs to learn everything he can, and going slow with this is probably the only way to do it.
Once he goes through the Bibles, work only with real tests. Hopefully his score will improve, but there's so much in the Bibles that he'll still be working on remember and applying it all, and getting to the point where the skills and tricks are coming naturally.
I also say work on accuracy first, and when he's getting the flow of the questions down and starts to get more right, *then* start trying to add speed into the mix. By the end of studying, he needs to have found that balance of speed and accuracy that works for him.