Harvard REA and website

I am planning on applying to Harvard REA. Since it is my dream school, I naturally want to increase my admission chances. I am very keen on STEM and would love to major in anything pertaining to mathematics in general (economics, applied math, CS, statistics). Is there any major with a higher acceptance rate or one with lower competition. Please do mention a list of majors with higher admission rates.

Also, is there a source I can check major wise admissions rates for different colleges.

I do remember checking the number of undergraduates in each major. Is that representative of the admission rate for that major.

Harvard doesn’t admit by major.

Harvard does not admit by major. Further Harvard allows almost complete freedom to change major (as long as you meet the class requirements) and doesn’t even require a student to declare a major until after the first semester of sophomore year. Your best strategy is to indicate a direction that is consistent with your interests as backed up by your accomplishments. That will make for a stronger more cohesive application.