If you are capable enough and if you have command over the subjects, which are studied in B.Tech stream then it is not at all compulsory to take any assistance, but if you think that you are not good at any point you should go for the coaching. In the order to crack GATE a good understanding of the basic concepts and their application is required. Following are some tips which will help you in cracking this examination:

Follow standard books, stress on understanding things than memorizing them.
Solve objective type questions as much as possible.
Go through previous year papers to check your knowledge and note the distribution of different topics.
Revision is one of the most important steps of the preparation process
Plan your study well
Manage the syllabus and topics
Make concise notes and ready to revise material
Test yourself frequently
Time Management-The Success Mantra
Cut off time from less important activities