If it is Nfer the usual format is, instructions for administrator,
Look at the example and see which letter has been circled.......Now do the two practice questions, put your pencils down when you have finnished.
Wait until all the pupils have finished before continuing.
The answers are C and E....You now have 8 minutes to do the 16 numbered questions. Begin now.
The technique is to use the practice time to do the practice questions and also look ahead at visible questions to try and gain some time.
So allow some time for practice questions and then 30 seconds per question on the timed section.