diff --git a/01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/07.optical-instruments-design/01.optical-instruments-characterization/02.new-course-overview/cheatsheet.en.md b/01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/07.optical-instruments-design/01.optical-instruments-characterization/02.new-course-overview/cheatsheet.en.md
deleted file mode 100644
index 193cd24fe..000000000
--- a/01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/07.optical-instruments-design/01.optical-instruments-characterization/02.new-course-overview/cheatsheet.en.md
+++ /dev/null
@@ -1,7 +0,0 @@
----
-title: 'new course  : overview'
-published: false
-visible: false
----
-
-new course  : overview
\ No newline at end of file