I use iPad 4 and iphone 4S for my teaching purpose.

I need to create groups of my student contacts based on the subject they learn.. There are students who will appear in more than one group as they learn more than one subject from me.

I need an app that would help me create unlimited groups with unlimited contacts under each group. I require the app to access contacts from the Native contacts app on iPad. I do not prefer google contacts as i have all of my contacts on iPad.

Please guide me.

thanks in advance !!