highlight all of the routes on the erc highs that you use in his practice questions, and wright the distances for the routes next to the route numbers on the erc high
Be careful if you do this. Some exam supervisors are extremely pedantic. After doing the practice exams successfully I was cautiously confident, so I made a serious effort to thoroughly erase all of the marks on my charts. Exams are stressful enough, and I didn't want to put more pressure on myself by worrying about having charts rejected on the day.
So the charts I took in were completely clean, except for some very faint remains of the marks from doing practice exams. The supervisor spent 3 minutes with a rubber making them even fainter and wasn't happy even then (and did the same again at the end of the exam !)