It is not a very common word, but it works in your sentences.
Student or Learner
Please would you correct the mistakes in my sentences. I wanted to know if I could use the word "tractable" in these kinds of sentences.
1. The ultimate goal of any government is to have tractable citizens who will never rebel or protest.
2. They drilled the soldiers until they became tractable and disciplined.
3. The class was tractable but for a few students who would interrupt the teacher now and then.
Indeed, I have certainly heard and read "intractable" but can't say I've ever seen or heard "tractable."
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.
I've heard this word most frequently used in reference to dogs.