500/600 with 1 month practice only?

Hey... I wanna apply for a B-School in South America and spontaneously decided to take the GMAT instead of the local test (i would have to fly 8900 km for a 4 hour test). Here's the thing, the test is on April 24th. I need at least 500, which would be totally fine and isn't super high, I guess, but ...