MCAS-5
MCAS stands for Massachusetts Comprehensive Assessment System. It's a series of tests, taken by Massachusetts students to determine academic preparedness. In this series of caches, you'll be asked to complete questions typically found on the 10th grade mathematics MCAS.
These caches are in and around Whitehall State Park in Hopkinton. A trail map can be downloaded at this location.
The rules are simple. Solve the various 10th grade problems. You can do it yourself, or you can ask a high school student. But come on - you should be able to handle this stuff! The cache is at N42 A.BC, W071 D.EF, where the letters refer to the problems to be solved. The cache MAY have multiple stages. In this cache there will be a clue necessary to finding MCAS-Final.
You can check your answers for this puzzle on Geochecker.com.
You can find a number of parking areas described as waypoints in MCAS-Final.