any advice would be appreciated

I had a few more questions that I was hoping you could help me answer.

1. Is it ok to conduct research on a student/ person without their knowledge? For instance, can it be observations? Can you create a fake claim for the purpose of the research, and then later reveal the true purpose?

2. All research needs parental permissions. Is that only if the research is going to be presented or published? What about when a school collects data from multiple classrooms and presents the findings. Is that considered research? Must they have parental consent?

3. Can you conduct research if the child without the consent of the child? If a child said they do not want to participate in the research, but their parent says yes, is it ethical to continue with the research?

Thank you for any answers you can provide.