Qatar has one of the highest homeschooling rates in the world, due to severe lack of places in schools. I don’t know much about homeschooling but I know my children learn better if it comes from a third party not me. If you are looking for material to assist in Mathematics have a look at the link below.
http://www.cimt.plymouth.ac.uk/projects/mep/
It provides material and guidance for Mathematics across a full age range.
You can always enter students through the British counsel to do IGCSE and A- level exams.