Where do your study strategies come from? Maybe a teacher gave you specific instruction on how best to learn material? Simple trial-and-error? All reasonable possibilities. However, here's some food for thought: it's also worth considering what psychological science has to say on the matter.
Welcome to the most popular time of the year for complaining over schoolwork. Instead of adding to the unproductive noise that usually detracts from everyone's focus, combat it with these helpful tools.