No, PRS does not have a code. You should use the homeschool code instead.
School codes for college entry exams determine where the test results are sent. If you use the homeschool code, the results will be sent directly to you. You can then enter test scores to your child’s PRS transcript by entering them under “Student Records & Reporting” on your account page. It is also a good idea to upload a copy of the test results to your child’s files for reference.
PLAN (pre-ACT test): 999-999
SAT Subject Tests: 970-000
PSAT/NMSQT: Not applicable