I have taken my SAT twice. The first time I took it was in November, 2017, and I scored 1450. Recently I took it the second time and I scored lower than the first time(1410). Would the decline of the scores jeopardize my acceptance chance as opposed to a increasing trend of scores?
No. If the college allows score choice, you only need to send the best one. If they don’t accept score choice, they will look at the best one. Besides, the drop is not drastic.
If I have taken both SAT and ACT, do colleges require both SAT and ACT scores or only one of them?
Only one.
Two colleges, Georgetown and Stanford, require you to provide both all SATs and all ACT scores for tests you have taken. With every other college in the nation that requires any test scores, you can send either SAT or ACT.