Please check your Junk/Spam folder. You can also try clicking the Forgot Password link on the homepage of www.groupingmatrix.com to retrieve your login information.
If you still cannot locate it, please contact your district IT department and have them whitelist groupingmatrix@reallygreatreading.com and www.groupingmatrix.com which will allow the emails to come in and try again.
Please email groupingmatrix@reallygreatreading.com with any questions.