NYPL Brainfuse HelpNow
This is a free eLearning service for all provided by the New York Public Library. Live tutors are available online every day between 2 pm and 11 pm EST for these subjects: math, science, reading/writing, social studies, PSAT/SAT, ACT, AP and state standardized tests. Additional offerings include a 24-hour Writing Lab and Foreign Language Lab / Spanish-Speaking Support.
You must have a library card to begin. Find a library near you.