Learn Russian: Да, она тоже студентка.

This answers a yes/no question like Она тоже студентка? (Is she also a student?). In Russian, you don't need helper words like 'is' or 'does' to make a question. You just use the exact same words as the statement but raise your voice's pitch on the key word. Then you reply with a basic Да (Yes).

Where is the word for 'is' in this sentence?

Russian skips the verb 'to be' (am, is, are) in the present tense. You literally just say 'Yes, she also student.' It takes a little getting used to, but it makes sentences shorter!

Why is the word for student студентка instead of студент?

Many Russian words for professions or people have male and female versions. Студент is a male student, while студентка is a female student. Since the subject is она (she), we use the feminine form.

Can I put тоже at the end of the sentence, like we do with 'too' in English?

It is much more common and natural in Russian to put тоже right before the word it emphasizes. So instead of putting it at the end, keep it as она тоже студентка (she also student).