I know exactly what you are asking for.
Unfortunately, to get an A on an exam without studying is impossible unless you cheat. But that’s not what you are asking for, you just want to pass.
But passing exams without studying is totally possible.
- Pay attention in class and try to anticipate what your teacher might test you on based on voice tone, repeating sentences/words…etc.
- Ask all your questions at the end of the class and leave no misunderstand behind at the end of the day.
Bonus: Preview a class and write down some questions you have.
Do all that and you don’t need to study to pass exams (again, just to pass). To get an A you do need to study unless you have a photographic memory.