Immediate sample solution for essay questions

I would like my students to receive a sample solution to their essay assignments immediately after they have completed a test. I have tried the feedback function, but the results only appear after I have graded the exam individually.
Now we also have practice exams, which only help the students to prepare for their exams. However, I do not grade them myself because there is a general sample solution.

Does anyone have any ideas on how the sample solution appears directly after the exam has been handed in automatically?

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