Is it obligatory to turn away from obsessive thoughts that prevent revision, even if there is something that needs to be initiated, and is the soul sinful if it does not consider that, and what is the ruling on delaying some duties for the sake of studying?

The cure for obsessive thoughts (waswas) is to ignore them and not dwell on them. The thoughts instilled by Satan are aimed at diverting you from what benefits you. Therefore, do not preoccupy yourself with thinking about whether a duty is incumbent upon you or if you made a mistake in your speech, as this is from the whisperings of Satan. Approach your studies with diligence and enthusiasm, and do not prioritize anything over them except what is absolutely necessary, such as prayers. Your studies are the occupation of the moment, and nothing should distract you from them.