Q: Working at Apple

Look at Apple's open positions and the qualifications needed to apply for these positions. There are different qualifications needed for different jobs.

You should also consider sharing your ambitions with Mr. Tim Cook.

BobTheFisherMan has a great reply.

Apple's job search:

https://jobs.apple.com/us/search#location&t=0&sb=req_open_dt&so=1&lo=0*BEL&pN=0

You may need to relocate.  UK offers a wide selection of jobs.

https://jobs.apple.com/us/search#location&t=0&sb=req_open_dt&so=1&lo=0*GBR&pN=0

In general, you want to do math / science in high school.  Being a good communicator will help you in any field.

R

Apple employs every kind of discipline that you can imagine - technical/engineering, design, software developers, marketing, sales, (a VERY long list)

You should study what interests you the most and get a college degree - without making Apple your "secret goal" - when the time comes, visit http://www.apple.com/jobs/us/index.html > then choose the [Search Jobs] button and narrow your search with the available filtering process there

Apple (and any other company) wants people that are the best they can be in whatever they love to do.

When you know what your passion is, check out the Biographies of Apple Officers in that discipline and learn from their "path to success"

apple officers and management - Google Search

https://www.google.com/search?q=apple+officers+and+management&ie=utf-8&oe=utf-8

For example:

Jonathan Ive - Apple Chief Design Officer

https://en.wikipedia.org/wiki/Jonathan_Ive