Dieting is not about not eating, eating seven points full and reducing the amount of food. It is best to eat only one kind of fruit at night. If you can't hold on, you can eat porridge, but you can't eat anything else or drink water after dinner.
As for exercise, I think it is best to do it before going to bed, and it is best to do anaerobic exercise after aerobic exercise. You can try to spin a hula hoop for half an hour.
Wish you success!