here is some good tips for people that can't pass tier7

1.You need to hide

2.Use High Damage weapon so you can kill them fast if they attack you

3.Don't shoot enemy if they don't see you because enemy will know where are you

4.If you kill enemy you need to get ready because the enemy know where you are

5.Try to change your name to tier7help or dontkillme this might help you

Helpful gadget

1.Stealth use this to be invisible so no one can see you

2.Immunity Shield use this when enemy attack you

3.Stun Grenade use this to stun enemy when they attack you

4.Spotter use this to see where is enemy

And there are some good hiding spot watch on the slide show