If you are an applicant with IMS I strongly recommend that you read the entire list and not just what you were looking for, because some of these are grave errors on their part and take you by surprise.
Information compiled so far:
1) The entrance exam has 1st year university level matter, so you need to put in extra effort.
2) There's only a single past paper for practice so save it till the end. Thought applicants through other agents, I think the one in the UK, have access to more papers.
3) IMS has a tendency to reply late or ignore mails altogether sometimes(usually old applicants). So make sure you get all your information ready and don't depend on them.
4) The Entrance exam is 1.5 Hours long and feature 20 questions per subject; biology and chemistry.
5) SGGW-Warsaw lost it's EAEVE accreditation recently (2013) if that matters to you. However a student from SSGW clarifies that it has not impacted their job prospects and the 2013 graduates have found jobs.
6) I was also advised this: Once you give the entrance and receive your results in around a week, follow up with IMS to check whether the application has actually been sent to the Universities.
7) If you are from a country that has been listed in their examination centers list and has 'to be announced' check with them from time to time even if they say with certainty that's it's not possible. It certainly saved me the expense of travelling all the way to Brno just to give an entrance exam.
8) IMS doesn't use a payment gateway, they actually expect you to trust them with you credit card details so you'd best apply before you're card expires so the new one eliminates this risk.
9) Be sure about your preferences if you're applying to 2 universities because in my case it turned out that there are seperate entrance exams and the 1st one you give is for your 1st preference. As your agents it ideally should've been them that asked you what dates you would like for each but this never happened for me and I live in India where the dates are not fixed as with many other European countries. Additionally no where on their website is this mentioned. I would think it a pretty important bit of information that they shouldn't leave out.
Note: The IMS question paper has no markscheme for you to validate your answer, a friend from another forum was kind enough to offer her help in solving the entire chemistry paper and providing the right answers. I've attached this document below.