Remove "entrance exams" under "standardized tests" page.

[Batman161803]

The SAT and ACT aren't exactly "entrance exams". They are aptitude based tests which serve as a "standardized" way to compare applicants within a pool.

I suggest removing this page and moving over the writings of the SAT and ACT page over to the main "standardized tests" page.

[MY-Sabil]

Sure! We can do that. Since you're keen on contributing, can you maybe make all of the changes in a single pull request? Thanks a bunch!