Many people think the estimates here might be relatively accurate o close:
http://collegeadmissions.testmasters.com/update-psat-scores-cut-national-merit-2016/
It puts Maryland at about 218.
We have a thread about cut off predictions here –
http://talk.collegeconfidential.com/sat-act-tests-test-preparation/1849640-national-merit-cutoff-predictions-class-of-2017.html#latest
Commended will be lower of course. Good luck.