JCoSS in New Barnet is again creating an extra class starting in September 2018.
The decision to offer an extra 30 additional lottery places follows a record number of applications.
Governors took the decision to alleviate “some pressure in the community”.
A total of 210 students will now be in the 2018/19 cohort.
“We have had in particular a very high number of first choice applications in proportion to the number of places we had to offer,” Headteacher Patrick Moriarty explained.
“We hope it will go some way to help anxious families feel a little less concerned.”
He added, “We have begun careful planning for the additional numbers, and as this year we are confident that it will be a smooth transition.”
Mr Moriarty concluded: “JCoSS continues to go from strength to strength.
“The addition of the new Dorfman Wing has allowed a wider curriculum for our sixth form students for A Level and vocational courses and from September we will now have two year groups with 210 students.
“Our results speak for themselves and we are delighted that we are able to give 1300 Jewish children an excellent academic, pluralist Jewish education that our community deserves.”
Parents struggling to get children into a Jewish secondary in Barnet last academic year were advised to send them to Whitefield School in Cricklewood.
Advice by Partnerships for Jewish Schools (PaJeS), a division of the Jewish Leadership Council, came after Whitefield headteacher offered Jewish Studies as a subject.
JCoSS is consulting on its 2019/20 admissions policy, which may include the removal of feeder schools.
The response deadline is 16th January 2018.