I have been flying on and off since I was 15, my flying skill have not increased as I would like them to (college eat a lot of time), I'm a safe pilot and can do the basics (takeoff, land, rolls, loops) kinda limited, I really like to start improving my skills. Unfortunately most of the people in the club I have been flying at (4 times in the past year) fly mostly on Saturdays, and I can only go on Sundays, so one on one is kinda complicated. Does any body have good resources on how to start on improving my skills? Online sources would be greatly appreciated, and any other resources you might thing will help me.

Thanks a lot