Academic stress among students affects the academic performance, what measures should be taken to cope up with stress to reduce it. [this sentence attempts to form a question, but it is not worded correctly. you could a) Reverse the order of the clauses first so you can begin with the question word or b) make two statements, the first stating the problem, the second stating the question] Or if it is positive then how it will be measured and in what circumstances it would be appropriate in performance of students 1. don't start sentences with 'or' 2. if it is positive is not a good case statement. Also if you are referring to specific subject (like what you have stated previously) you would use the definite article 'this'. So I would say 'If this is the case...' 3. the word order of your next segment is incorrect. the order should be 'How will it'. note that it is a question, inside the sentence. However, because you are speaking hypothetically (what you say only applies if the question is true) we should say 'how can it' 4. the last part is missing an action. 'and in what circumstances would it be appropriate [to do something][conjunction][article] performance of the students. e.g. 'and in what circumstances would be appropriate [to try to reduce stress][to improve][the] performance of students. 5. performance of students - , this is only correct if you are speaking of students in general. If you are speaking about only the students who require assistance following measurement, then you would say 'performance of those students'

Short answer: No. There are 4-5 errors. Perhaps you should submit it as a notebook entry for correction?