This nicely packed booklet made by teachingisgood clearly and simply explains all the subject pronouns, indirect and direct object pronouns. It also comes with an explanation of when these may need to change, where to put them in a sentence and using two object pronouns together, etc. It starts off with the basics of finding an object and a subject in a sentence and progresses to how they would need to change in a sentence.
After going through all the conjugation and explanations, there is an activity bit at the back with 10 questions for each important topic, consolidating that vital knowledge.
This all packed into one but neatly, and simply, so that students and teachers can always flip back, and quickly find what they need.