T25 alpha should I do another 5 weeks of alpha

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I am almost finished the 4 week of T25 Alpha. I am doing all modifiers. I can do all the exercises as long as I do the modifiers but I am not as fast as they are. I have one more week of alpha to go. what I am trying to figure out is if I should do another 5 weeks of alpha or more on to the beta. Has anyone completed this program or currently doing it that had a similar problem. Thank you