Best of Luck for the exam.
Luck plays a significant role in spite of all your preparations and effort. Keeps finger crossed.
Keep in mind The Exam is like a cricket match – 10 wickets.
In the match even if the first wicket or subsequent wicket falls unexpectedly – do not panic – the runs / marks can be scored in the other wickets.
Keep your cool and wish you again. Have a good sleep night before the exam.