Congrats @rebecca12345 – regarding sending scores - I think it depends on your intended area of study and what the colleges you are interested in require - some ask for a math/science and a liberal arts SAT subject test. Some might say none required but any are welcome - choose your best - ok to send 2 in same subject area. Some may require all scores from tests you took. So, it varies. You can see the percentiles of scores on different SAT subject tests here:
https://secure-media.collegeboard.org/digitalServices/pdf/sat/sat-percentile-ranks-subject-tests-2015.pdf
Hope this helps some.