The application process is standarized for all potential undergraduates and is detailed on the University of Oxford Admissions website. For specific information relating to the interview process please see here.
Although you can specify a college choice in your application, the application itself is made to the University and not to the individual college. Colleges work together to ensure that all candidates receive equal attention regardless of their college choice.
Feedback on your application is only sent upon request. If you wish to receive feedback, please email undergraduate [dot] admissions [at] hertford [dot] ox [dot] ac [dot] uk and (execept during the interview period itself) we aim to provide it within twenty working days from receipt of your request.