It is really hard to crack gate with a month's preparation specially if you are going to start your preparation from scratch. However you shouldn't waste more time now and work really. Go through the syllabus, Practice the problems, go through previous years question papers, join some good series and put all your efforts in this month. There are many students who have been working hard for years to crack gate but don't lose hope. For more info you can visit the following link:
It requires lot of hardwork as well as luck because their are many other factors acting as well such as number of students and difficulty of paper.
As of Now you should join a good test series, attempt it whole heartedly, revise previous year questions and formulae.
Hope this helps.All the best