Nothing you can learn on the night of June 6 will show up on the paper of June 7. Cramming that night hurts your sleep and produces almost no additional information in your head.
Pack your bag by 8 PM. Admission ticket, ID card, pencils, pens, ruler, compasses, eraser, water bottle. Lay the outfit out for the morning.
Eat a light, familiar dinner. Do not have coffee after 6 PM.
Read something for pleasure for thirty minutes. Not a textbook. Not a mock paper. A novel, a comic, anything that is not the exam.
In bed by 10:30 PM. If you cannot sleep, do not panic — lying quietly is worth most of what sleep gives you. Do not check your phone.
Set two alarms. Trust your preparation. Turn off the light.