This might be repeated question, but i am not able understand those answers or it old post?
I am having a windows meachine, how to develop a iphone app and test that in simulator?
Is there any IDE or tools which can be install/work in Windows?
No, you can't, you need a machine with OSX in order to compile Objective-C, so unless you run a virtual machine or install OSX in your computer, you can't.
You can create an App using Appcelerator, Xamarin, etc, but it won't be native Objective-C.
Find a more extended answer here:
How can I develop for iPhone using a Windows development machine?