Something I noted about my adult students in class they like to mentor the younger students, the experience that they bring helps the younger student to understand some complex concepts, and I found the younger students will respond to the older students Vs me. At the same time you have to monitor that the older students do not try to take your place, from time to time.

Cheating is easy for a student to do if the opportunity is there! Take control of your testing environment. To start I give multiple versions of the test the students take A, B, C and D. I remind the student if caught they will fail the test and take a walk to see ED manager where it could lead to suspension; I walk the room when the testing is in progress.