PSA to ADC's, let your support get in EXP range
there is nothing that annoys your support more or loses the the game faster than taking lane CS or shoving while the support isn't in exp range.
it doesn't matter if you are level 7 or lvl 8... if im not lvl 6... i don't have ulti and THEY DO..
also... if i am lvl 10 or lvl 15 and i ping that i want some exp. ITS BECAUSE I HAVE A HUGE POWERSPIKE at those level of ulti. im a support, i buy support items. those really don't increase my capability much, however losing 20 second off a cooldown of my ultimate because i lvled it up WILL help a LOT if i can do that before we get into a teamfight.
keep an eye on your team's level. and keep an eye on their mana... (or energy) this is some thing i rarely ever seen people in lower elo do. and its is tremendously important. to know when u can get a free kill or when you shouldn't go in because YOUR SUPPORT IS OUT IF MANA AND FREAKING PINGED IT THREE TIMES
u know... we need to back to buy items