The schedule is too tight. You may need more time to prepare GMAT because you will take TOEFL first, but it really depends your English level. One month for essays is too short. You also need to handle other things, such as recommendation letters, your college transcript and find the way to pay the application fee.
It depends on which school you want to apply. For tier-1 (top-20) schools, you definitely need more time for your G/T, and don't forget it takes much more effort for essay. So, I would suggest you wait for next year. Tier-2 schools might be all right.