If you spent a few minutes looking at the challenges instead of spending days complaining you may find it. The forums are here for hints, and there are many hints available. Just have a look through the challenges and stop being so lazy (no offence meant)

I have looked through all the exploit levels. Couldn't fint it. Please tell me which category it is in?

OMG!!! I'm so tired of this thread. Hmmmm I forgot how to wipe my own ass could you help me please? Give me a break, if you can't find it you don't deserve to solve it, so just stop asking. Sssshhhh!

Just tell me which category it is in?

well, in what category would you expect???

exploit

now that you know just do it

I found it but couldn't solve it

I would tell you that you could find some hints probably in the forums but you might ask for a few days where they are too.