There is a lot to be said for completing as much testing as possible during junior year. It takes some stress off to know what scores your kid has going into senior year, otherwise it is hard to finalize their list. Both my kids were only left with one subject test retake in the fall of senior year (weren’t totally happy with their first scores). Get visiting out of the way by the start of senior year, too.
And start with identifying safeties – school you are quite certain they will get into, they like, and you can afford. It takes more elbow grease to find them. Then move on to matches & reaches.