General knowledge is not a subject you study. It accumulates from a hundred small exposures, which is why ten minutes daily beats a three-hour session once a month by a margin that surprises people.
Read narrow, not wide
Trying to absorb everything produces nothing. Pick one area you are weak in — say, capital cities, or twentieth-century history — and stay there for a fortnight before moving on. Depth in one area also gives new facts something to attach to. Isolated trivia slides off; trivia connected to a structure you already have tends to stay.
Test rather than review
Rereading a list feels like learning and mostly is not. Cover the answers and say them out loud — the effort of retrieval is what builds the memory, and the discomfort is the signal that it is working. Getting something wrong and then seeing the right answer is more effective than getting it right easily. Do not avoid the areas where you score badly; those are where the gains are.
Use the gaps in the day
Ten minutes rarely exists as a block. It exists as three minutes waiting for a kettle and four in a queue. A quiz app or a list on your phone converts that time; nothing else will. The habit matters more than the material. Someone doing ten minutes daily for a year will comfortably beat someone doing an intense month and then stopping.
Track what you get wrong, not what you get right. The wrong answers are the only part of a quiz that tells you where to spend tomorrow’s ten minutes.