The answer is simple, very important! Every year, there are a number of candidates who get rejected not because of something they lack, but simply because they didn't turn up to the interview at all or they turned up late. Make sure this doesn't happen to you. Set alarms weeks in advance, inform your friends/family members to call you up prior to the day and inform, or leave notes on the refrigerator. If you are an especially forgetful person, make sure you leave no stone unturned in being ready for the D-day when it comes.