Platooning with people is definitely a way of improving your basic skills and teamwork as you can co-ordinate with your platoon members more easily than random people on your team. The latest version of the WoT server allows players to form platoons from the battle map itself, making it easier than ever to find players to join up with.
I would say that playing with people who are better than you is a great way of improving yourself. Watch where they go, how they outplay opponents and work alongside them in support. Soon enough you will be able to take their place and show someone else the ropes!