messed up

so i checked my marks yesterday and what i found was pretty devastating ( i mean i got what i deserved ) but just to be clear heres my backstory - so i did foundation for a year then i joined offline coaching with dummy school for 2 years. At the start i was pretty excited and confident as to how im gonna handle out things but mid 11th i started scoring low and shit so i kinda lost the motivation all together then again i decided on doing my 12th justice so i started studying and gradually as the end year approached i just did the same thing previously, i fumbled, but last ke 2 months i gave my all, i joined a test series, completed my syllabus ( completed only about 70 percent ). In mocks i used to score above 100 easily to be precise i used to score above 50 in physics, above 40 in chem and maths i used to fall in the range of 25-40 but when i checked my score i found out i scored below 30 altogether with negative single digit in chemistry, i mean i still dont get what the fk happened like it wasnt as if mujhe ata nahi tha i was clear with physical and thoda org and inorg on the most parts, like atp i cant even face my parents and shit knowing theyve given so much and 3 prep and i manage to score negative in chem. Like abhi i dont need a lot sympathy from yall but i just need few tips that could probably fix what went wrong in my first. TLDR - i fumbled and score below 30 in first attempt and chem mai negative hai, i just need help from yall to boost my prep (mera syllabus 70 - 75 % clear but practice ki kami hain in most parts and im not a dropped )