First find out the group exams which you are going to appear. Find the syllabus for that group exam. You can search for the syllabus on internet. After taking the syllabus, check what all materials you have for preparation and what all you still need. If you are not sure about the preparation methods, you can very well go with the article as suggested by the above member. All the best for your exams. Keep in touch with Tamilspider to know about the latest updates about TNPSC exams.
Practice makes perfect..