I will distribute exam papers to you. Take one and pass the rest to the person behind you. You have to solve the 10 Engish problems in 5 or 7 minutes. When you are finished with solving the problems, I will write the answers on the blackboard. You have to mark your exam papers. Are you finished? How many students have 10 points? Well done.
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Would you check the passage? Thank you.
The instructions are clearly stated. Grammar is good. The sentences beginning "Are you finished?..." should be separated into a new paragraph. For it all to make good sense and to be correct, you might attribute the instructions to the professor/teacher:
"The professor's instructions were, 'I will distribute...'
After the teacher wrote the answers on the blackboard and asked, 'Are you finished?...'"