Can you attend school, job training, or start a business with a pink ID card in Thailand?

I have to say, Bradley, the card specifically spells out that you are NOT a Thai citizen.

IT IS interesting the different experiences people have with the pink ID.

Well in my experience it varies a lot per purpose, situation and where you show it. But most of the time in combination with the yellow housebook. Think, before getting the pink ID-Card, you must have the yellow book first. E.g. Before you did not need a "certificate of residence" for a new 5 year drivers license on a 5 year drivers license. Now, at least at Chokchai/Korat DLT, you only get a 2 years extension on y'r 5 year drivers license.

Only when you have "a certificate of residence" from imm., you get the normal 5 year extension.

Many times you can use it for a hotel, but also a drivers license is okay. Many times it's more easy to get things on your name like car, internet subscription etc.

The biggest advantage I had, was when I had covid (not sick, but rules, rules, rules then 🙄) and had to go to the university hospital here in Korat for 12 days. It was 4,500฿ a day and did not have to pay the 54,000฿.

So indeed, it's a very doubtful and random advantage.

I got the pink card and the yellow housebook. While the yellow housebook is the perfect substitute for a "certificate of residence" from Immigration, the pink ID card is good for nothing. It doesn't even grant me any rights entering a National Park, I still need to pay the Farang price

Its the most worth less card in Thailand and has nothing to do with working , except in BKK u get the Thai price in Tempels, Themeparks etc.

A pink ID card has nothing to do with any of that. It's just an ID card. It doesn't let you do anything except identify who you are.