Agree with @Stephanie57049 that it depends on your circumstances. But be super wary of burn out @"Lauren L" . It can really slow down and harm your studying progress.
Thanks @jknauf, @nessa.k13.0 and @"Alex Divine"! Out of curiosity @jknauf, do you, by any chance, regret not taking the diagnostic? I mean, since you didn't have an initial score to help gauge your progress?