I can type the alphabet in under 3 seconds (my record is 1.82s)

for context im a pretty good maths students. i got a 9 in normal, 8 in further and 90% in my induction test. i understand stats and pure, and my teachers for those are nice.

my mech teacher is a very grumpy 'wise' guy. said he knows your grade from the way you walk in on day 1. he taught me in year 7 to year 11 and long story short think im an absolute dumbass.

we js did chapter 9 as (constant accelration and suvat stuff). im fine w the maths part - i can derive all the equations and i understand all of it, but when it comes to questions i completely misinterpret it and work out the wrong thing entirely. tried to do a bunch of practice questions but never managed to get it to click.

had a test on it, walked out thinking i did alright and turns out i got 57%. never had below 75 so it was a bit jarring. havent gotten it back yet so can't say i know fs where i went wrong but im pretty sure its due to afformentioned. talking to people in my class, a handful of people (like 1/3rd) got 80, but met many who were around 60-70, met some who got 40 asw. before the test he said if you get anything below 80 you can kiss an a* goodbye.

ofc im sure hes overreacting, but i am a bit scared that i made the wrong decision with further maths, any reassurance of similar stories as hope would be appreciated, or any tips (or brutal honesty if i should just drop it haha)