Which loan should be drawn first? Which special repayment should be made?

Okay, does that mean that after full drawdown the agreed installment of this loan would have to be paid? Additionally, from 7/1/20 interest of 1.56% per drawn amount would then be due for the 250k loan, as well as 2.5% p.a. for the undrawn part? Only after full disbursement the agreed installment?

You have to look in your loan agreement, because it is stated there. In my case it was exactly as you described, but there are other possibilities as well. For example, a date could be agreed upon from which repayment starts. And you pay interest from the day of the drawdown on the amounts utilized, not only from 7/1 - that is formulated unclearly in your text.