I'm taking the postgraduate entrance examination this year, so I have to ask my senior sister at school for information. We haven't met before. What should I say when texting?

Send a text message first, be sure to make it clear, don't be vague, and show sincerity if you hide something. Try to be respectful, and then send a text message the next day asking if it is convenient to call her. After the other party said that the time was fixed, I called the other party. Don't call lightly.