For Primary school it is less of an issue. What you do at home is more important than which particular school they attend. Read to them every night, have them read to you every night. Do spelling exercises each week. Be careful about what TV you put them in front of (Numberblocks good, Youtube bad) etc.

For High School, we went with the “move to good school catchment” method. It has worked out well for us, but damn is it expensive.