500 on GMAT vs 300 on GRE

Hey I got a quick question. I am currently looking to go back and get my MBA. I graduated from undergrad in 2009 in Accounting and Finance. the school I am wanting to go to is looking for a 500 on the GMAT or 300 on GRE (146 on Verbal and 144 on Quantitative). For one I was wondering, just how hard ...