diff --git a/internal/services/lmsprogress/service.go b/internal/services/lmsprogress/service.go
index ad46909..d2d20cf 100644
--- a/internal/services/lmsprogress/service.go
+++ b/internal/services/lmsprogress/service.go
@@ -118,7 +118,8 @@ func (s *Service) CanAccessModule(ctx context.Context, userID, moduleID int64) (
 	return true, "", nil
 }
 
-// CanAccessLesson requires the module chain to be accessible and the previous lesson in the module to be completed.
+// CanAccessLesson requires the module chain to be accessible and the previous lesson in the module
+// to be completed based on published practice completion in that lesson.
 func (s *Service) CanAccessLesson(ctx context.Context, userID, lessonID int64) (ok bool, reason string, err error) {
 	lesson, err := s.store.GetLessonByID(ctx, lessonID)
 	if err != nil {
@@ -135,11 +136,13 @@ func (s *Service) CanAccessLesson(ctx context.Context, userID, lessonID int64) (
 		}
 		return false, "", err
 	}
-	has, err := s.store.LmsUserHasLessonProgress(ctx, userID, prev.ID)
+
+	// Lesson unlock for STUDENT now follows practice completion, not deprecated lesson-complete writes.
+	prevCompletedPractices, prevTotalPractices, err := s.store.LmsUserPracticeProgressInLesson(ctx, userID, prev.ID)
 	if err != nil {
 		return false, "", err
 	}
-	if !has {
+	if !lmsProgressComplete(prevCompletedPractices, prevTotalPractices) {
 		return false, errPrevLesson, nil
 	}
 	return true, "", nil