EU/EEA citizens can enter Croatia with just a valid ID card (or passport) and then need to register at the Central police station if staying for more than 3 months to regulate the residence permit.
You might need the originals of your "Letter of Acceptance" for your visa application; if so, please let us know as early as possible so that we can send it to you via mail in time and do also provide a shipping address.
health care insurance
All exchange students must have health insurance during their stay in Croatia.
oib (personal identification number)
number assigned by the Tax Administration of the Croatian Ministry of Finance.
prerequisite for student enrolment at FEB
FEB IO can request OIB on behalf of exchange student
CROATICUM - Centre for Croatian as Foreign and Second Language offers semestral as well as monthly courses
University School of Croatian Language and Culture
More info: http://www.unizg.hr/homepage/learn-croatian/