These lists are not exhaustive, but give you suggestions to begin your search for answers to numerous questions (and remember, this is not an endorsement of or recommendation as to the effectiveness of any such website or entity, and the Family College Experience receives no compensation for providing these links):
College Admissions Exams
SAT -- https://www.collegeboard.org/
ACT Exam -- http://www.actstudent.org/
The Common Application -- https://www.commonapp.org/
The Coalition Application — https://mycoalition.org/
Interviewing - InterviewEdge Consulting -- http://interviewedgeconsulting.com/
Applying for Financial Aid
FAFSA -- https://fafsa.ed.gov
CSS Profile -- https://student.collegeboard.org/css-financial-aid-profile
Virtual Learning Opportunities
Coursera—https://www.coursera.org/
Additional Resources—https://www.swagbucks.com/articles/the-ten-best-ways-to-get-free-college-classes