Diet classes and calories

Hi all, i'm on and off this all the time but decided to get back into it. I recently started going to a diet class in my area, kind of a weight watchers style class. I am a bit dubious though as its a check system i.e. every 25 calories is 1 check but i'm only allowed 45 checks which equates to 1125 calories. Surely thats not enough calories to have a healthy weight loss? I was always told to eat at least 1200 calories which is whats given on here. Do you think its best to just stick to the 1200 and hope for good results?

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