diff --git a/book/_toc.yml b/book/_toc.yml
index ccee3d16..3612dcb2 100644
--- a/book/_toc.yml
+++ b/book/_toc.yml
@@ -25,7 +25,7 @@ parts:
   - file: chapters/00-introduction
     title: "Introduction"
 
-- caption: 🧱 Building Blocks
+- caption: 🏗️ Foundation Tier (01-07)
   chapters:
   - file: chapters/01-tensor
     title: "01. Tensor"
@@ -35,23 +35,19 @@ parts:
     title: "03. Layers"
   - file: chapters/04-losses
     title: "04. Losses"
-
-- caption: 🧠 Learning Systems
-  chapters:
   - file: chapters/05-autograd
     title: "05. Autograd"
   - file: chapters/06-optimizers
     title: "06. Optimizers"
+  - file: chapters/07-training
+    title: "07. Training"
 
-- caption: 🖼️ Vision & Data
+- caption: 🧠 Intelligence Tier (08-13)
   chapters:
   - file: chapters/08-dataloader
     title: "08. DataLoader"
   - file: chapters/09-spatial
     title: "09. Spatial"
-
-- caption: 🗣️ Language & Attention
-  chapters:
   - file: chapters/10-tokenization
     title: "10. Tokenization"
   - file: chapters/11-embeddings
@@ -61,10 +57,8 @@ parts:
   - file: chapters/13-transformers
     title: "13. Transformers"
 
-- caption: 🎓 Advanced Topics
+- caption: ⚡ Optimization Tier (14-19)
   chapters:
-  - file: chapters/07-training
-    title: "07. Training Abstractions ⭐ Optional"
   - file: chapters/14-kvcaching
     title: "14. KV Caching"
   - file: chapters/15-profiling
@@ -78,7 +72,7 @@ parts:
   - file: chapters/19-benchmarking
     title: "19. Benchmarking"
 
-- caption: 🏅 Competition
+- caption: 🏅 Capstone Project
   chapters:
   - file: chapters/20-capstone
     title: "20. AI Olympics"