If you feel confident about your Latin/Romance general vocabulary (you already know how they work), I would recommend you to read old teaching/natural method books.
Like these ones, the first has every page written in french and english (1647,but its like Assimil series), and the second is from basic school: https://play.google.com/store/books/details?id=yWf4czen8jIC
https://archive.org/details/enseignementprim01brunuoft
Old books are free :)