how can i completly perfect prepared for cmat exam in 1 month

There is no complete preparation as such, you need to be done with studies completely as first step.
Now coming to one month strategy, first week shoukd be dedicated to reviision and focussing on weak areas as well as study of all formulae.
Second week, go with GK preparation from sites like Jagranjosh and books like Manorama.
For last two weeks just simply give 7 mock exams and Analysis of your mistakes is must.
Make sure you rectfy them and dont repeat again.
Analyse how much time you devote to tough questions and if your approach is correct or not.
Last 3 days should be for mock revision only and simply stay calm and relaxed to ace the exam.