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1. A very good site for practical tips and know-how to preparig yourself for various clerical exams - the first link below, there is anopen forum too from where you can pick up useful pointers to preparing yourself.
2. Lot of samples question papers for you to solve. Many test papers for Test of Reasoning, Numerical Ability, Test of English, and clerical Aptitude Test are given in the second link. It will help you test yourself on your preparation.
There is also a list of recommended books for these exams.
This is a very exhaustive site where you will get all the information you will need.
You can buy competition master magazine or go through their site - www.competitionmaster.com . Competion master magazine are good for clerical as well as officer's level examinations. You also get questions for UPSC, SSC, NDA and banking exams.
You can buy other magazines and practice papers from the market.