In iStudiez Pro there's a possibility to export the schedule (classes and exams) from the app to third party calendars.

iStudiez Pro exports the schedule via Calendar URL. 

If it is possible to import Calendar URL into Outlook, thus, you'll be able to export your iStudiez Pro schedule there. 

Please check next links, they might be helpful: 

Please be aware, an update of Outlook calendars may take more than 24 hours. Read more here: 

Thus, you may have to wait some time for the changes you've made in iStudiez Pro to appear in Outlook Calendar.

Sometimes events from iStudiez Pro are shown 1 hour ahead/late in Outlook. 

It seems to be a known issue of the calendar. 

You may read more about it here: