The girl I like is now taking the postgraduate entrance examination. How to keep in touch with her by mobile phone without disturbing her study?

Postgraduate entrance examination generally depends on her food. If you have a good grasp, talk to her on the way to the canteen or restaurant after reviewing. Maybe she will change her mind for you. And greetings to get up and go to bed in the morning and evening. It is best to persuade her to pay attention to her health. Since we are ordinary friends, we should be gradual, not too dense (come every day), not too close, just care a little every few days.