I'm getting suicidal thoughts

I'm in 12th standard right now boards in exact 1 month the only subject I'm thorough with is business studies even there i forget a lot of things out of anxiety during exam, economics I haven't studied since December 1st week and accountancy I'm just at the threshold... Really scared for my future, I just want 90++ in boards which seems impossible i haven't even solved 1 sample paper until now as I have 0 confidence I scored only 55% in my pre boards which were conducted in December. Still scope there to score 90 with barely 1 month left? I know i sound unrealistic and stupid but this is my condition nowm.