Need a android and IOS application to run online classes

We are a NGO LOOKING FOR DEDICATED PEOPLE TO WORK TOWARDS WELFARE OF KIDS ( nursery to 10th standard )
We need below aspect to be in focus
Online class room
Various subject class room
Log in for teachers and kids as per role
Study material upload / download via admin
Study material upload download via students
Home work submit
Attendance
Remark
E learning for reference links for kids
Quiz for kids made by teachers
Discussion room
Circular
Calandra
Fees
Kids ranking and remark
Performance report daily monthly weekly
Results
Library
Achievements and rewards
Media submissions at various point
Class recording
Educational forums
News
Analytical data for every thing on dashboard
Email bulk
Message bulk
Apply leave for kids and teachers
Syllabus
Consent forms
Stationary supply

We also need input from developer for better product and arrangements .
Thanks