Just some information for you.....here in america dissociative disorders is no longer listed among personality disorders. there is no dissociative personality disorder now. the personality disorders now are .....
(from the index page of the DSM 5)
Personality Disorders
General Personality Disorder
Cluster A Personality Disorders
Paranoid Personality Disorder
Schizoid Personality Disorder
Schizotypal Personality Disorder
Cluster B Personality Disorders
Antisocial Personality Disorder
Borderline Personality Disorder
Histrionic Personality Disorder
Narcissistic Personality Disorder
Cluster C Personality Disorders
Avoidant Personality Disorder
Dependent Personality Disorder
Obsessive-Compulsive Personality Disorder8 • DSM-5 Table of Contents

Other Personality Disorders
Personality Change Due to Another Medical Condition
Other Specified Personality Disorder
Unspecified Personality Disorder

the dissociative disorders now have their own grouping rather than in with the personality disorders.

a bit more information...I know many people who have dissociation problems, and are college students and do wonderfully, the key is learning how to....ground....yourself back in reality....

example I take college classes....when I start feeling dissociation symptoms I do something physical to put me back in touch with reality and out of my dissociative symptoms... take notes (writing them on a note pad or typing them into my notebook's writing program) I also take with me some sort of recording device so that I can audio record the discussion, that way not only do I have my notes I have the class discussion to help me remember what goes on in the classes I am in.

one of my therapists once told me never let my problems run me or I will end up with a life full of regrets, I wish I had..., I should have....

I have a choice.... I can do nothing and use my problems as excuses to not having the type of life I wanted or I can get active and turn my life into the kind of life I want to have...mentally and physically handicapped people can do anything normal people can do...they may have to jump a few extra obstacles and figure out which ways work for them but its possible for me to become a therapist... and she was right.. I had many challenges to navigate through, like my memory problem and dissociative symptoms but with creativity and perseverance I made my life the way I want it to be...

if you want to go into your field of choice talk with your treatment providers they can help you gain the tools you will need like grounding, and other things that can help you remember whats going on in those classes you want to take... they might even know of some agencies that can help you with special grants, aids/equipment that can help.