What are my chances of getting into an ivy league college...Please help?

I have graduated from my sopre year in high school and will be a junior next year. To be honest my freshman year was not wonderful. My grades fluctuated throughout the year, but I remained an overall A/B student with few Cs. My sopre year I took my first AP course which I received a high A all year. I took all honors gifted courses along with the AP course and like my freshmen year my grades fluctuated. I was able to maintain relatively good grades all year until fourth quarter when I ended up getting five As and three Cs! For my junior year I will be taking four AP courses and the rest honors/gifted. Also I am taking Spanish so next year (junior) I will be Spanish three. My extra curricular activities include drama two and I hope varsity soccer if I am able to make the team. Also next year I plan on all As since I know it required of students wishing to attend an ivy league school. As a junior I will be applying for president of ecology and literary club. I also plan on applying for a few board positions such as Students Against Drunk Driving (S.A.D.D.), Astronomy club, and Student Advisory Comity (S.A.C) etc., but I know not to go over board. For my Senior I will be taking all A.P courses with the exception of my extra curricular, and if things work out I will be the President of two clubs and V.P or board of some others. Lastly I am currently a member of National Honors Society. -I hope this is enough information to determine if I am capable of getting into an ivy league school :) P.S If you have any tips and/or advise please let me know below.