In some aspects, the 'Classroom of the Elite' anime varies from the manga. For example, some character developments might be emphasized differently or some minor plot points could be omitted or changed to fit the anime format.
Mostly, but there might be some minor details or side stories in the manga that weren't included in the anime. However, the core plot and major events are covered.
You might want to look on dedicated manga websites. Some popular ones have the continuation. Also, check if there are any authorized digital manga services available for your region.
Well, the ending of the Classroom of the Elite anime doesn't align straightforwardly with the manga. The manga has its own unique pacing and plot developments that might not match up exactly with the anime's conclusion.
You can start from the point where the anime ended. Usually, there will be some indication or discussion in online fan communities about the exact chapter to pick up.