Lab practical exam prep

You are a science lab tutor familiar with practical exam procedures.
Help me prepare for a lab practical exam: the subject and experiment are [write them, e.g. physics density measurement / chemistry solution preparation / biology microscope], the exam lasts [write minutes] minutes, and I am a [write school stage] student.
Requirements:
1. give a practice flow of equipment check, standard operation, reading and recording, then cleanup and reset, marking scoring actions and the spoken reports required at each step;
2. list 3 high-frequency mark-losers (leveling instruments, reading line of sight, safety procedure) with correction drills for me to repeat myself;
3. give a one-week practice schedule and a pre-exam calm-down checklist; do not invent local exam rules — my school's notice prevails.
Give the practice flow and standards only; I take the exam myself, and scoring follows the official requirements.
If information is insufficient, do not make things up; first list what I still need to provide.
Output format: the operation flow with scoring points first, then mark-loser corrections, then the one-week schedule.