Re: the name of my secondary school is/was SLS
With your first question, I would find it quite unnatural to say "The name of my secondary school is/was ..." I would expect to hear "I attended XXX Secondary School" or "I went to XXX Secondary School". If you must construct it the way you did, then I would say "The name of the secondary school I attended is XXX".
Originally Posted by nelson13
For your second question, I find "You are/were from an international school" very unnatural. We don't say that someone is from a school. "You went to (or "attended") an international school".
Alive or dead, we use the present and the past tense to refer to what writer's want/wanted to say. There is no rule.
Remember - correct capitalisation, punctuation and spacing make posts much easier to read.