I don't think examination specific books are available online. For examination specific material u need to contact NCR-Education which offers training..I think in India it operates from NCR-Mumbai..All the best.
Tom Coffings book as really good but I suggest you get some training and experience behind you as well as some questions will might need rely on your experience and past exam knowledge.
I personally had the privilege of attending a Tom Coffin course which JUMP Started my TeraData carree but I still had been working with it for a year before training.
The books sure helped a lot but I dii some extra research and practicing concepts to cement my understanding of them.
Just remember each TD Exam is setup not to catch oyu out but to test your knowledge of the subject and the exam I wrote will most likely not be the same exam questions as you wrote because NCR changes the exam every two weeks and no two centres in the same area have the same paper for that period. This is the reason why, if you should fail and exam you have to wait TEWO weeks before you can rewrite the exam.