What is the test for withdrawing a guilty plea for abuse of power?

We review a trial court's refusal to allow the withdrawal of a guilty plea for abuse of discretion. United States v. Hoyos, 892 F.2d 1387, 1399 (9th Cir.1989), cert. denied, 111 S.Ct. 80 (1990). Appellant cites two reasons for the withdrawal of his guilty plea: (1) that he was not informed of the U.S. Attorney's policy of allowing individuals arrested with less than 100 pounds of marijuana to plead guilty to a misdemeanor under 21 U.S.C. 844(a) and was not offered such a plea; and (2) that he did not understand the consequences of his plea because he did not speak English and had a limited education.