IPCA European Command: Training Center is the training mission of Syphon Filter: The Omega Strain. Unlike the trilogy, where a training video was provided, players are physically involved in the game mechanics, including environmental hazards, navigation techniques, carrying and hiding a body, general combat manoeuvres with a variety of weapons - assault rifles, grenades, tasers, knives and even armed combat dummies with flak jackets - and shooting numerous targets within a time limit.
There is no specific guideline that can be provided except for the advanced target range. You will need a weapon that has a high ammo capacity, like the C8 rifle. Sniper rifles are ill-advised due to their scope. Have a look around before shooting the targets so you get a general idea of their position. This is rather tame compared to the true missions so there's no harm doing this as many times as you need to, familiarising yourself before gunning through the main game.
Finish the advanced target range: Scorpion submachine gun
Finish the entire training, regardless of target range: Smoke grenade and K-BAR