User Management

Hi,

I need a little bit help with user management.
I have an education site (not ready yet), i need two registration:

First for students, they can register to courses with name, email, phone number etc.

Second for teachers, who can register with name, email, year of birth etc., but teachers can register for courses too.

But when a teacher wants to register for courses too, i want that she/he can use same email address, name etc. too. And i want it, after a teacher register both place, on the wp-admin/users i see just one registration.

Thanks for your help!

PS: Sorry for my english