The Club

Doing each level on Insane is not particularly difficult if you've already got a good grasp of the game. What I'll do is explain what each of the levels are and any quick tips.
You do not need to win the tournament .... just survive. You'll have 5 tries at each level.
It's possible to make a backup of your save on a USB stick, so if you are struggling with a level you don't have to start the whole tournament again. Just reload your save if you fail 5 times.

Warehouse

Level 1 : Sprint
Just play through the level, take your time and get to the end. No time limit

Level 2 : Siege
Turn around and stand to the right of the doorway. Look towards the front of the room and shoot them as they come up the ramp. Its 3 minutes long, so not too bad

Level 3 : Sprint
Same idea as Level 1

Level 4 : Time Attack
Make it to the end before the time runs out. 2 laps. Shoot as many enemies (this gives you a 3 second bonus) as you can and just keep moving. Health Packs do not respawn in these levels

Level 5 : Survivor
After trying a few different points around the map I found the best place to be is behind the gas tank (to your right when you start). You only have 3 places to watch out for. Upper right (above you), straight ahead and watch out especially for the ones who come around the front of the tank. When your health gets below 80 run forward to get the Health Pack and return to the same place

Level 6 : Run The Gauntlet
Get to the end before the timer runs out. You get 1 minutes 30 to do it

Warehouse done