We all learn at different rates and some of us have different preferred learning styles. Try and understand the big picture first, then the formulae and make sure that if you cannot grasp a concept you get some remedial help. Pictures and world globes are great aids. What am I trying to do, apart from getting from A to B? - I have to think about wind, the curvature of the earth, time zones and the failings of maps and charts to represent what is really there on the ground. When the concepts are mastered it begins to make sense. Perseverence is required, and consider some extra tuition - it is only money!!!