The MIT Open Courseware is a rich resource for learning. In this
link you can find learning materials for high school students.
This is the link to Stanford Math Tournament website. In there, you
can find previous problems which can be useful for Math Olympiad Review.
Above is the link to the website of Philippine Science Letters.
This is the link to ASCD website. ASCD is the main proponent
of Understanding by Design Framework
This is the link to Philippine Studies Journal, a refereed journal
published by Ateneo de Manila University.
This is a link to Harvard University Graduate School of Education current faculty researches.
This links to Harvard Education Review website.
This is a link to EducationNext website which a joint initiative of
Stanford University Hoover Institution, Harvard Kennedy School
and Thomas B. Fordham Institute.