Before commencing the preparation for any exam it is necessary to know the exam pattern. ITCAT exam consists of five parts: Computer Science, GK, Aptitude, General Science and Engineering and Mathematics. After this the next step should be to know the syllabus for all the parts mentioned above. Divide your time schedule such that each part get its due focus. After covering the syllabus look out for any online test series and if you are not able to find them then look for previous year papers and try to solve them with in the actual exam's time duration. This will help you introspect your learning graph and time management skills.
All the best!