Todo this follow these steps
1. Invoke new time table wizard
2. Select Class TimeTable Type and enter the name as Class xxx Exam
3. Add the exam days by choosing custom and creating new TimeTable day type.
4. Select the Timings and finish the wizard
5. Fill the subject
6. Fill the Room
7. Fill the Tutor/Invigilator
Let us know if you need any more help..
KTS Team