Those mean different things.
The first means you have exercises on vocabulary, and you are presenting here part A of those exercises.
The second means you have several parts on vocabulary, and you are presenting here the exercises on part A.
According to the exercises that I have, the one that fits is the second one.
Can you give us an example of such a question?
Previously, students have learnt about wh-questions that ask for the name of a thing or an animal, and their corresponding yes/no-answers.
Exercise:
There's a picture of a cat and the exercise is as follow.
____ ____ ____ ____? Yes, ____ ____.
The solution:
Is this a cat? Yes, it is.
What do you mean by illustrated? If you just mean examples, then say "Subject Pronouns - Examples".
What I mean is that there are pictures of people with balloons saying "I, you he, she, it, we, you, and they", not just the list of subject pronouns.
I guess “Subject Pronouns - Examples” is enough and using “Illustrations/Illustrated” isn’t really important to be mention and doesn't add important information.