What is the best way to train an assistant in the assistant api currently?

There are some questions that the models always gets wrong, is there a way to train it to respond it correctly? Maybe with another file?

What kinds of questions is it getting wrong? Have you tried knowledge retrieval from the assistants API yet?

I’m already using retrieval, is that there is some data in the files that the model always gets wrong, even when its specificaly written about that data.