I find the drills on this site helpful, you can select what types of verbs and what tenses you want to work on: https://www.laits.utexas.edu/fi/vp/

Duolingo doesn't teach the passé simple and has a small lesson on the futur simple (near the bottom of the tree). The site given by MikeNolan6 is very good but also does not drill on passé simple (however, it does discuss them). See here: https://www.laits.utexas.edu/tex/gr/tap10.html

EDIT: I just remembered this course on Memrise is terrific for learning conjugations - https://www.memrise.com/course/756657/verb-conjugations-en-francais/.

try also listeningpractice.org