Silverzone Foundation will release the IOEL 2019 result in the third week of January 2020 on the official website, silverzone.org.
So, you can check it on their official website once it is released. There is no particular cutoff for this. It is totally based on number of participants, scores of students, etc.
For more details, check the link below: https://www.google.com/amp/s/school.careers360.com/articles/ioel-result/amp
Hope this helps!