The text you provided has a few inaccuracies regarding the education system in Russia. Here’s a corrected version:
Russian children start school at the age of six or seven, not five. The primary school in Russia typically consists of four years, not three. English is often taught in primary schools, contrary to what is stated in the original text. The school year indeed starts on the 1st of September and usually finishes in late May or early June. The summer holidays last for about three months, not two. Lessons typically run from Monday to Friday, which is correctly stated in the original text.
Here’s the revised text:
"Russian children go to school when they are six or seven. There are four years of primary school in Russia. They do have English in primary school. The school year starts on the 1st of September and finishes in late May or early June. There is a three-month holiday in summer. Lessons are from Monday to Friday."
This version should more accurately reflect the typical schooling experience in Russia.