New applicants can apply online to be a substitute teacher or substitute instructional assistant through the FCPS Instructional Talent Gateway. This handbook provides the most current information on the evaluation process.The City of Fairfax Schools district is like no other in the state. If ordering online is not feasible, complete this paper request form and mail to the address provided on the bottom of the page. The letter asks you to complete and return the Affirmation of Citizenship form to maintain your voter registration. Fairfax County Public Schools apologized for putting teachers to the test a phishing test on the last day of school. Please view the college verification form checklist to ensure you have filled out the form yet correctly. Prospective Students. Provides direct care and supervision to school age (6-12 yr. Fairfax County Public Schools.