I recently found out that there are multiple PTT modes for the TI 84 Plus CE. I'll list the differences here:
Information from:
Adriweb
Mateo
mr womp womp

---

USA:

• Activation combo=[<]+[>]+[on]
  
• Status bar color=Blue
  
• LED color=Green
  
  
• Disabled:
  -Apps
  -Programs (including making new programs)
  -Pic/ Image vars
  
  
• Optional disable:
  -Stat diagnostics
  -logBASE
  -Summation
  

---

Netherlands:

• Activation combo=[+]+[enter]+[on]
  
• Status bar color=Orange
  
• LED color=Orange
  
  
• Resets:
  -RAM
  
  
• Disabled:
  -Some apps (allowed: conics/inequalz/polysimult2/languages)
  -Prgm (including making new programs)
  -Images
  -App vars
  
  
• Optional disable:
  -Stat diagnostics
  -logBASE
  -Summation
  

---

Singapore

• Activation combo=[8]+[2]+[on]
  
• Status bar color=Blue
  
• LED color=?
  
  
• Deletes:
  -Apps
  -Programs
  
  
• Custom reset screen when complete.

There's also different reset combinations, i.e. [5][2][on], [8][2][on] and [8][5][on]. May as well know those too

Some more various information about the exam modes...
On the ti-84 plus CE-T, there is an LED that blinks green when in regular PTT mode, and blinks orange when in the Netherlands PTT mode. (Because the monochrome ti-84s couldn't just color the status bar )
The Dutch PTT mode deletes appvars as well.
Disabled Apps don't appear in the Apps menu but still appear in the MEM menu with a '≠' instead of a '*' next to them.
The language apps also don't get disabled.