Other websites:

Boston Centers for Youth & Families
www.cityofboston.gov/BCYF/
Boys and Girls Clubs of Dorchester
http://www.bgcdorchester.org/
The Harbor School
www.boston.k12.ma.us/harbor
Pope John Paul II Catholic Academy
www.popejp2catholicacademy.org
Richard J. Murphy School
www.boston.k12.ma.us/murphy
Patrick O'Hearn School
www.boston.k12.ma.us/ohearn

Test registration websites:

ISEE:
Independent School Entrance Exam
http://www.iseetest.org
SSAT:
The Secondary School Admissions Test
http://www.ssat.org
HSPT: (Better known as the Catholic Schools Test)
VISIT: The website of the school in which you're most interested. You can register for the test from there. There is no official website for the HSPT.