Hi yeah these are probably the 2 best schools Here in Phuket there are a few other high standards international schools which will be slightly cheaper but probably Circa 350,000++ ....
I'll try to find a video Canadian chap did with website & league table prices etc...
Yeah private international schools aren't cheap here...
No you're not Taxed if it's from savings or pension, it's only on money earnt during that Tax period, so no tax to pay plus many many countries have dual tax treaties or DTA etc...