Hi there, actually to be honest the final game of DUO is a hard one but definitely not impossible. It took me also 6-7 attempts to beat it. And I remember by 70th min of the game I had taken the lead of 4-3 and then just killed the time to win the game. And anyone the final one was only able to get one star out of three; coz anyway hitting and assisting one is really difficult. Just a suggestion use the Mbappe set to play this game as his pace will help you. And try to score as many goals in early of the game coz after 70-75mins your all players would be too tired to compete with those insane bots.
All the best.