Most efficient way for high school to learn equivalent of Spanish 1

Hi! I have a 9th grader enrolled in Spanish 1 and it is a horribly taught class - no classroom control, a dial-it in teacher. He is not learning anything but needs to take both Spanish 2 and 3. His high school is rigorous (other than the Spanish classes) so he already has a lot of his plate in terms of homework. Advice on the most time-efficient way for him to learn what he needs to move to Spanish 2 on the side. We are happy to pay for a course to make it easier but there are so many options and I'd like something that is somewhat aligned with Spanish 1 curriculum.