Hello,
In Bujumbura there are internationals schools, both in eglish and french languages
There is also a school for english speaker only, with UK system, there is french school with France system, there is also Belgian school.
All those are private schools with many expats children.There are also other private school but with local children
If you have another question, do not hesitate to ask, i am burundian
I hoep you will enjoy Bujumbura