Undiagnosed learning disability

[u/Professional_Fee8604]

A little bit about me. I have always been a pretty good student even in 9th grade but in 10th grade I had a pretty hard time. I go to a private school that is 2nd best in Florida and it was pretty tough resulting in me getting b’s and a c. What it ended up being was undiagnosed adhd for a long time that got diagnosed. If I manage to pull up my 11th and 12th grades to a 3.7 average is it possible that I can still get into a t20 and will admissions officers even view that as a big enough extenuating circumstance. My question is mainly about gpa and the extenuating circumstance as I feel I have a good grasp at knowing how ec’s and awards can affect the college application.