Standardized test dates are confirmed for Spring 2021. Registration for the ACT and SAT I are prioritized for eleventh-grade students. Any tenth-graders who would like to register must first receive approval from the College Advising Office.
| Test | Date | Registration Info |
| ACT | April 17 | https://www.act.org/
School Code- 220685 Test Center Code- 234820 |
| SAT I | April 27 | https://deerfield.edu/students/college-advising/standardized-testing
Registration is through Deerfield Academy and will open on December 7. |
| SAT I and SAT Subject | June 5 | https://collegereadiness.collegeboard.org/
School Code- 220685 Test Center Code- 22312 |
Families interested in signing up for an AP Prep Course through Revolution Prep can visit College Advising’s Test Prep Page to sign up for the applicable course(s) and time(s). All courses run for six weeks starting the week of March 21, with one hour of live instruction each week. Courses are $399, but families should use the code DEERFIELD299 for a $100 discount before January 31. Deerfield employees and students who may qualify for aid should not use the links to sign up; instead, contact Michelle Sullivan at (860) 924-7334.