pls help

so recently my mom has really been on my case. it started when she looked at my grades. in 3 classes i had a score in the 80s..and im usually a 90s student. i explained to her these are ap classes which makes them really hard. she then progressed to say it's bc i never study and that im not studying for the SATs. the thing is im not denying it. it's just i have alot of programs. i have an internship in a lab and a prep program. my mom has really been on me lately..and it's not only academics..she now complains about everything i do. what should i do? thank you.❤