I don't have required testing for certain Match Schools... Should I drop them and apply Regular?

Hello!

I am a bit worried about my application. I do not have all of the required testing as I did not pay attention to the dates. Due to this, I have to remove some schools from my College Match. If I remove them from my College Match, can I add them when I want to apply for regular decision, if I don’t get matched to the schools that I ranked? I think the website said something about being able to, but I just want to clarify. For example, if I remove MIT from my College Match, can I apply through Questbridge Regular Decision?

In addition, if I get denied to a University through the College Match, can I reapply through regular decision? Or does being denied not allow me to reapply?

Do you think that I should email the schools about that I want to go to and ask if they can make exceptions on the test score dates? I honestly do not even know if my October ACT will come in time.