Spells function best when some sort of context exists for them in which to manifest. Have you acted in the physical world to work on the situation you intend to address with a spell? Spells will not solve your problems for you. They will help, but leaving them to function without putting any other effort in on your end reduces the chances of the spell coming to successful fruition. Would you cast a spell to pass an exam for an area of study with which you had no experience? What would be the point of that?