IB Candidate School for PYP offering international education in English The IST at a Glance International School of Tallinn (IST) was founded in 2016 and opened its doors in September 2017. IST is conveniently situated a five-minute walk from the airport and very near to the tram stop. Our school location is Keevise 2. The school owner is Mainor Group, who has provided high-level education