Exams And shiits

(ALSO LETS NOT QUESTION THAT IM 19 AND STILL IN HIGHSCHOOL I DID SPEECH THERAPY DURING KINDERGARDEN AND IT SOMEHOW MADE ME DO KINDERGARDEN TWICE)

Its like March already and my exams are in late may. God my stress is at its PEAKNESS i cant go on with my life without overthinking every single shit atp..

The teachers at tuition told me that i study.. like i study a lot. Its just my mind is a whole chaos and its bringing my perfomance down. 

So wtf is the solution? Dont stress it? (Surely helps a lot!) Like lets not stress the fact that my field is in nature very competitive (mind u ill go for computer science and the bases of the grades starts from 17+ (the scores are the average of 4 subjects from 0 to 20)) 

Also i have this retard of a teacher in my school being on my pussy about not paying attention in her class when in my intuition we were like 2 chapters behind because she JUST WANTS to speedrun this. Like no i totally get it you wanna be done with your material but like be more fucking considerate its not like im learning economics from u since ur speedrunning every shit (she isnt even an economist but okay ig)