In the Philippines, well, in our University (University of Santo Tomas), our chemistry courses go something like this:
Chem 101 and 102: Undergrad General Inorganic Chemistry (taken during our first year in college)
Chem 201 and 202: Organic Chemistry I and II (sophomore)
Chem 301 and 302: Analytical Chemistry I and II (sophomore)
Chem 305: Instrumental Analysis (junior)
Chem 402 and 403: Physical Chemistry I and II (junior)
Chem 501: Industrial Chemistry I (junior)
Chem 601 and 602: Biochemistry I and II (junior)
Chem 502: Industrial Chemistry II (senior)
Chem 206: Advanced Organic Chemistry (senior)
Chem 306: Advanced Analytical Chemistry (senior)
Chem 104: Advanced Inorganic Chemistry (senior)
Chem 404: Physical Chemistry III -- more on quantum chem (senior)
So I guess the first digit changes per course/subject, while the last digit changes with respect to what level it is being taught. As for graduate school chem subjects, I've heard that they just increase the last digits and add the letters MS or GS, hehehe. Our codes here, I guess, are weird.