Microsoft cannot remove or bypass Lightspeed Filter Agent because it is controlled by your school, not by Microsoft. The filter is installed and managed by your district’s IT department, and they are the only ones who have the admin credentials to change or remove it. Microsoft does not have access to those passwords, cannot override school security settings, and cannot provide any method to bypass them.
The only way to get websites unblocked is to contact your school IT staff or teachers and ask them if certain sites can be reviewed or added to the allowed list. It is not Microsoft's place to assist you here.