You go to the Deans building (Katerinska), then you get the testpapers. After you finished the question you wait until the results are up. If you passed the tests you will be invited to an interview and after passing that successfully you will get a letter of admittance. With this letter and your High School diploma (details can be found on the faculties webpage) you will go to the enrolment date and get the formalities done. Thats practically it.
As far as I know there are no 'specific papers' to study from, but there is a list with topics u need to know for each subject. But those topics cover everything anyways, so it doesnt really help a lot.