For the UC schools I have to send in all results from every test I have taken, but the ACT doesn't seem to have score choice. How can I send them all my scores? Do I need to send each individual score to the school or can I send them everything at once?
You have to send each ACT score to the school individually. Score choice is the default on the ACT rather than being a specific policy. Each score report will include one composite score from one test date; if you want to send scores from additional test dates, you will need to order additional reports.
From the ACT website: "We report ONLY the scores from the test date you designate, not any other test scores."