play more against people and NOT against bots.
don't send lone squads, unless it's capping teritory in your backyard.
drop mines on paths most likely to be taken by vechicles
watch the timer and get some AT by the 10 minute mark
If you're moving several squads, keep rifles at the front and SMG's behind them. When you find enemy, put rifles behind cover and start trading, while SMGs move trying to get in close.
If you're moving MG's, use A+move
If you're retreating vecihcles from combat, always use Reverse move.
If you cannot steal abandoned team weapon/vechicle, A+move on it with tanks/AT guns to destroy it instead.
If enemy tank hides behind smoke / LoS blocker, use Attack Ground to try and nail him anyway.
retreat immediatedly from the fights if the odds are against you AND you have no means of turning the engagement around (flanking squads, abilities, getting to cover)
Learn to use smoke
(mortar smoke + SMG squad rush clear MG's better than mortar HE barrage)>brits
get vickers first and put it in the most central garrison you can find.
ALWAYS fight from cover
UC is for harrassment and dmg dealing, it cannot tank.
When using commandos, put them on hold fire, put them behind a cover that your enemy is likely to take and wait for them to come. When they get near, open fire and enjoy a free squad wipe.