It's good that you're alive, tasks from Sniper are not easy. Let's wait for a little before the next test. There is going to be a lot more complicated sniper work from now on, so my advice is that you master your bolt-action rifle handling skills some more. Come back when you're ready.
Ready? Then let’s get to work. Sniper took a big interest in you.
Keep in mind that to level up the Sniper Rifles skill you gain experience per hit, not just kill. With this in mind, you'll level this skill faster by shooting limbs instead of the chest or head as you can land more hits on your target to gain more exp before killing them.