You have fairly good chances all around. You have good test scores all around and your GPA for Sophomore and Junior year looks good. I’d say your biggest weakness is GPA but you Junior year was really good so I’d say its overlook able as your only main weakness. Regarding APs you’re definitely taking enough for your Senior year. I agree with your weakness that taking more APs earlier in HS might have helped but overall you’re still taking right amount. ED your chances will definitely be more favorable because your lower grades as an underclassman will be more easily over-looked. I’d say if you apply ED you can be fairly sure you’re getting in, whereas in RD you still have a good shot but you may not get in. If you’re absolutely sure NU is your top choice, you should apply ED for maximum overall admittance chances (like 33% ED vs 7% RD). Also so you know for MMSS you have to apply separately for admission into the program alongside your NU application. I took the same math classes (AP calc BC and Stats) this year and got in, and the admit rate is fairly high as long as you meet the math prerequisite requirements, but thats something to consider if you’re applying ED if thats the main major you want. Good luck!