1. Trial contract
The probation period is the unit's test for you, and it is also your test for the unit. The general probation contract has not been verified by the labor department, so it doesn't matter if you don't go. At most, I am dissatisfied with the working conditions of this unit and choose not to work in this unit during the probation period. As for confidentiality agreements, most of them are on paper. What's more, you went to study, and there is no disclosure of company secrets when you work in related industries. What's more, you didn't go to work, which is irrelevant. You just need to talk to that company, and it's usually no problem. After all, it is a probation period, and they didn't pay you. Besides, you haven't worked all day.
2. Refuse to pay your salary
You chose to study instead of going to work. How can you refuse to pay your salary?
3. Archives problem
You haven't become a full member, and the company won't transfer your file. Where it was and where it is now.
4. Welfare benefits
The general company will not help you pay the probation salary. After the probation period, I will help you to get probation benefits.
I hope my answer can help you again.