Sure, it's necessary to open another account.
I mean, cent one is just a substitution to the demo, at least, according to many traders who work with this company, they state Cent account serves as ak ind of transitional stage.
It's easier to learn emotions control while trading on the cent, and when you will go for others you will receive tighter spreads and way wider choice of assets for trading. As for income increase, then you will have the one, but it depends on you. Try to consider Standard or Micro accounts.