Check any dead soldier encountered until you find someone with a grenade attached to his belt. Make sure that his grenade is visible from a far location. If needed, take the corpse and reposition it. Then, get a good distance away and shoot that grenade.
Progress through mission 3, "Kaiser-Friedrich Museum". Make your way to the bridge, plant the explosives, clear the museum, then go up to the vantage point. Wait until at least one Russian tank is on the bridge to before sniping the explosives you planted. The best moment to shoot is when the first tank reaches the second trapped pillar. If done correctly, a cinematic showing the bridge being blown and a tank falling in the river will play.
Shoot the explosives to stop the convoy from your position, then run all the way down and kill everyone else.
Play the "Neudorf Outpost" from the DLC under the Cadet difficulty setting. The first objective is to reach the middle watchtower, where you can take out the soldiers guarding the outpost. Start by clearing the path to the tower, beginning with the sniper on top of it. Then, take out the guards outside the bunkers followed by the guards inside them. In order not to be spotted, only fire your weapon when it can be masked by a loud noise. You can also use your Welrod against the soldiers in the bunkers. If desired, hide the bodies inside one of the bunkers so they are not found by any reinforcements do not find them. After reaching the top of the tower, your next target will be the sniper on top of the watchtower on the other side of the outpost. This will leave six soldiers patrolling outside the buildings (left entrance, left buildings, center building, near the railroad, right entrance, dam in the back) and two of them inside the bunkers located at each of the entrances to the outpost. Finally, take the explosives and plant them before the arrival of the reinforcements (about two minutes after you reach the first objective). Once planted, exit the outpost stealthily. Use the exit that leads to the bunkers and avoid the direction from where the truck arrives. Then, get to the extraction point.
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Begin mission 8 under Cadet difficulty setting. Progress until you trigger the cinematic after finding the map. Then, go upstairs and stand in the open area. Snipers will begin to shoot you. Kill all eight snipers. You should find five in the first half of the ledge and three snipers when you enter the second half.