In the real world, no. In comic books? Yes. The way you get better at something is to find the top dog and get them to show you. Cass can meaningfully improve Dinah's martial arts skills. In order to be the best detective in the world you must learn at Bruce's feet. You want to be a better magician, pick one at random and follow her around until she agrees to clearly, swiftly, and expertly teach you the ropes, by sheer virtue of being pretty good at talking backward. No reason Oracle should be different.