Diane,
We'd be better able to help your son if you were a bit clearer about what "problems" he needs detailed information on. Human rights? environment? health? trade? general economic? infrastructure? politics? I know of no single comprehensive report or reference in English that covers them all.
For many of the areas, where reports do exist, the report is in Spanish. One notable exception is the PAHO assessment of the public health status report of the DR, which you can download from PAHO's website at
http://www.paho.org/english/sha/prfldor.html , but it is probably too dense for a high school junior. Regards, Keith