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

[Sonic J]

U do know that u can play ND easy with mix passing (only put red arrows dl and dr, then u can attack with ur dl dr as flanks, it's not just a formation through the middle..

Yea, you are right mate! I play Narrow with mixed passing. Though, I switch sometimes depending on how the game is progressing, I switch ND to 3 MCs, erasing the AM BUT my focus passing is ALWAYS mixed passing.
This gives your players flexibility if your opponent plays a DM.