Dhameystir weedha soo socota: Inta lagu guda jiro labadiisii xilli ciyaareed ee Stanstead, Jankowski si dhakhso leh ayuu u kordhay dhererka, isagoo koray 6'2 ", halka ay ahayd ciyaartiisa oo soo jiidatay dareenka indha indheeyayaasha. Ugu dambeyntii waxaa loo doortay 2012 OHL draft, oo loo qaaday doorashada 11aad ee wareega 7aad ee Saginaw Spirit inkasta oo uu diiday inuu ku biiro kooxda. Xafiiska dhexe ee xulka qaranka ee National Hockey League (NHL) ayaa Jankowski ku qiimeeyay inuu yahay 43-aad ee rajada ugu wanaagsan ee kooxda.
2012 NHL Entry Draft ee qiimeynta ugu dambeysa, horumar ka yimid kaalintiisii 74aad ee warbixinnadii hore. Falanqeeyayaasha kale ayaa ka sarreeya, oo ay ku jiraan Craig Button oo ka tirsan Shabakadda Ciyaaraha, oo isaga dhigay 41aad. Calgary Flames ayaa isaga xulatay wareega koowaad, kaalinta 21-aad. Waa ciyaaryahanka ugu sareeya abid ee laga soo xulo dugsi sare oo Canadian ah. Flames waxay heleen dhaleeceyn qaar ka mid ah inay "ka baxeen guddiga" oo ay u doorteen Jankowski meel aad uga sarreysa meeshii laga filayay ee loo soo qaatay, laakiin kaaliyaha maamulaha guud John Weisbrod wuxuu caddeeyay in inkasta oo hibada Jankowski ay ahayd "cuntada", kooxaha kale ay hubin lahaayeen inay ku doortaan wareegga koowaad haddii Flames aysan sameyn. Maareeyaha guud Jay Feaster wuxuu ku dooday in Jankowski uu ahaa mid ka mid ah ciyaartoyda ugu hibada badan ee la heli karo. Markii la doortay tiradiisu waxay ahayd 6'2.5", 168 pounds.