2. 'Yes, I do. But I (REVISE) everything, and it's not going to be too difficult for me. Harry was not afraid of the test.

Solution:

The verb 'REVISE' needs to be in the present perfect tense to indicate an action completed in the past with a result in the present (having revised everything means it won't be difficult now). The subject is 'I', so the present perfect form is 'have revised'.

Answer: 2. But I have revised everything.