hey guys can u help me with this !!!

I have taken Gmat twice and am yet struggling to get 700 + mark.

if i take it for the 3rd time ; then do b-schools take the average of all the given test or the best of 3 attempts.

Need this information does it depend from region to region or from b-school to b- school if so plese provide me the link from where i can confirm it.

thank you so much

jai.