As others have said .. its different for everybody , have a chat with your cbt instructor on the day of your cbt and see what he would recommend for you (he would of been watching you on the bike all day ) . I did this and went with what the cbt instructor advised , I had a days training for mod 1 with the test the next day in the morning , the rest of that day was mod 2 training , mod 2 test was booked for the following week , had another full days training with the test the morning after and passed ! Best of luck with it all .. its one of the best things I've ever done and well worth all the nerves and worrying beforehand!