TOEFL less than 250?! What exactly score you got? If yours is between 240~250 and with more than 5 WE, I think you can try. However, I wish your GPA is 3.0 up. By the way, what do you mean OD/SHR?
As to school report, yes, you have to notarize it. From following:
1. World Education Services Inc http://
www.wes.org
2. International Consultants of Delaware Inc. http://
www.icdel.com
3.World Educational Credentials Evaluators
http://users.erols.com/wecewellington
Actually, JHU cares much about your WE!!! And then your English ability. As to GMAT, you don't really have to worry about it. Good Luck!!!