HELP STUCK AT 1800

Hello lemme start from the start i first met my favorite extracurricular activity in junior year September just before school started and that activity was called SAT. I know what you are thinking how can that be your extracurricular activity well lemme continue. So i didn’t want to put much pressure when i came in junior year with the sat so i decided to take an prep tutor one of the best from my city. The tutor made a fortune doing sat he had tutored 100s of kids per exam and making over 500000 dollars a year. That was a pretty good cv for me so i joined one of his batches and i joined a group of 8 students paying him 2000 dollars and after a month of his prep and his prep not completing(btw i was preparing for December test of my junior year)i took his practice test basically past papers from 2005-2013 so my first practice test went with a 1650 and was pretty a happy as i didn’t finish his prep course and was aiming for 2200. So i completed about 8 practice tests with an average of 1650. I was pretty disappointed over no improvement although my math score was 720+
and i told my parents the night before the december test that i should change test date but they said not to and i gave the exam i got a 1590 gutted with the result i started preparing for jan test and did about 7 practice test and working hard and ended up with a 1670. pretty dissapointed and really gutted i signed up for may exam without thinking and then i realized it was inbetween my igcse to late and i decided to treat it as a practice test ended up with 1430. It was a pretty bad mark but i was concentrated on my igcse and got all As gladly. So i enter senior year a month before i sign up for another prep company with an intention of getting 2200 and went through the course and they told me they canot prepare me for the october test but i signed up any way i did with then about 9 practice test with an avg score of 1750-1850 and when i took the october test i got a 1700 gutted again. I am now taking it in november i know every single strategy i have done every single book with rpacitce test the BB Blue book PR Kaplan Barrons you name it i have done over 15 test with new company that i joined with in august with 1750 avg score and error analysis with the 15 tests were mainly silly mistakes i have spent over 100 hours doing practice tests 100+ hours prep and now im really gutted i cant get above 2000 even. I am pretty bright as i mentioned above with 5As except for english i got a D which i have withdrawn and im really bad at english
AVG MATH SCORE = 700
AVG CR=550
AVG Writing score = 550
ESSAY avg = 8
please help me all my mistakes are mainly silly
what should i do know
i am also taking the act in december with sat 2 mathlevel 2 and physics
please tell me how to eliminate silly errors
and any advice please