I´ve been taking classes for almost two months now to help me access music school one day and I´m making some progress. This is an excercise my teacher told me to do to get more control over the modes (It´s the doric mode in this case). The thing is to play every doric mode folowing the circle of fourths(just the circle of fifhts but backwards because on a real situation music the most comon armonic movement is a fourth) over It´s seventh chord.