Update textbook.en.md

00.brainstorming-pedagogical-teams/45.synthesis-structuring/math-tools/n4/textbook.en.md

@@ -4,10 +4,10 @@ published: true
 routable: true
 visible: false
 lessons:
-    - slug: brainstorming-123-mathematical-tools
-      order: 1
+    - slug: brainstorming-234-mathematical-tools
+      order: 3
 ---
 
-#### Brainstorming on the mathematical tools required at level 1
+#### Brainstorming on the mathematical tools required at level 4
 
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