How to increase map awareness?

Hello, everyone! Recently I am having problems with the enemy jungler. Ever since hitting gold, I feel like I am getting ganked by him much more often, far more often than I am ganked for. This is particularly a problem when the jungler plays extreme gankers, such as the infamous or . It seems like I am ganked RIGHT after I use my flash or after I use my ultimate offensively. Also, they always seem to come from the an area that I didn't ward (ex. if I ward the left mid lane brush, he comes from the right). I know this is NOT my jungler's fault, it is 100% my own. Ever since I started playing, my map awareness was (and still is) Christopher Columbus level. However, this is a very frustrating problem to deal with, especially when I'm beating my laner 1 v 1. So I want to ask the community: How do I increase map awareness and avoid jungler attacks? My main lanes are mid and top, and my main champions are , , and . I would really appreciate any and all constructive feedback!