Daniela Reyes had been teaching DELE C1 prep for four years before Marin Prep brought her on as the lead Spanish tutor. Her pass rate had always hovered around 60%. The cohort was small (12 students), the curriculum was tight, and the tutoring sessions were one-on-one — there wasn't much obvious slack to remove.
What changed when Marin Prep switched to Koydo wasn't the curriculum. It was the visibility. Daniela could see every student's writing samples in the gradebook in chronological order — and the engine had quietly flagged a pattern she hadn't caught: four of the twelve students were making the same subjunctive-trigger errors at the same point in the curriculum spine.
She moved the subjunctive deep-dive lesson two weeks earlier. The pattern broke. Eleven of twelve passed C1 on the first sit.
The parent-facing weekly digest did something similar on the admin side. Marin Prep had been the kind of program where parents emailed twice a week to check on progress; the digest pre-empted 73% of those emails by surfacing what the parent would have asked. Dr. Eleanor Lee's inbox stopped feeling like a tutor-status helpdesk.