Hello aspirant

hope you are doing well and safe. With reference to your query,  I would glad inform you that neet syllabus of 12th is quite wide so it is next to impossible to prepare at high level from sratch . During these 5 days , I would advise you are clear with 12th fundamentals ,practised questions on some topics and have good command on it , then instead of touching new topics , start revising old one throughly in 4 days and give mocks on alternate days and focus on 10 years questions . In last day , just keep yourself relax ,dont do anything  and dont think about anything

Hope you found this answer informative. Best wishes for your future