Junior high school English teachers should conduct classes exclusively in English and be periodically tested on their skills in the language using a third-party proficiency test, and formal English instruction should start in the fifth grade of elementary school from 2020, according to a blueprint for education reform unveiled Friday.

As part of the plan for elementary to high school English education, more assistant language teachers also will be hired, education minister Hakubun Shimomura said.

"We want to raise the standards for English education at the junior high and high school levels by having teachers conduct classes in English in junior high school, and focusing on the presentation and debate aspects of English usage in high school," he said.