http://www.artofproblemsolving.com/community/c5h1203978_99_on_amc_12_b_aime_qualification
another response from MAA
#149 6 minutes ago
The cutoffs are
10B: 110
12B: 100
http://www.artofproblemsolving.com/community/c5h1203978_99_on_amc_12_b_aime_qualification
another response from MAA