Andrew Ng's notes are orgainized a little strangely -- there are files cs229-notes1.pdf through cs229-notes12.pdf, with the ...notes7 split into an a and b files. Each file typically has 1 part, although the first ...notes1.pdf file contains Part I, Part II, and Part 3. Chapters are typically numbered consecutively within the file, for example chapter 5 is the first chapter of Part II, but it is also the 5th chapter in the ...notes1.pdf file. A table of contents for Ng's notes is attached below.