Every questions set up with marks Hide and Hide rest if fail
but students watch full table (all right and wrong tests) any way.
Why? Can CR show them only the fist wrong test or Compile error only?
That shouldn't be happening. Are you quite sure the students are seeing the hidden tests? As a teacher you will be seeing them in the results table, although they are shaded a darker colour. But students shouldn't be seeing them at all.
Can you post a screen shot showing the problem, please?
I was sure Question preview works the same as the test for sudents.
Students do not watch the tests.