how to to win against this 3-4(RM CM CM LM)-3

[Catalin Joel]

Not necessarily. I've had great results against better teams with better players playing flanks.
I just defeated a guy who is way above me in rating 5:0 and I don't play wings. Like I said before, playing to the strength of your team is important. But what I try to do is, whatever formation I'm playing against, I try to overload the mid-field.
I play narrow but my focus passing is MIXED.

So you are saying that best result for narow, passing set mixed?

[Sonic J]

So you are saying that best result for narow, passing set mixed?

YES, esp if your opponent plays with a good DM.
Occasionaly, you might want to consider this also, if your team is struggling, try playing with 3 MCs, that is, subbing your AM for another MC and keep the passing MIXED. It gives your players flexibility of movement.
Alternating your formation during a game also gives you an advantage cuz it disorientate your opponent.