"primary school years" is correct and usable in written English.
It is used to refer to the period of time when a person is attending primary school. For example: "She enjoyed her primary school years and made many lasting friendships."
Those succumbing to the infection now came through their primary school years unscathed.
"We do want to see a less crowded curriculum particularly in the primary school years".
In my own primary school years I read everything I could find, which amounted to at least four books a week and as many comics as possible.
During my primary school years, though she was a single working mother, mum was heavily involved in the PTA (Parents and Teachers Association).
And, as someone for whom primary school years marked the apogee of my Valentine accumulating career, I find all this jolly upsetting.
But throughout that day and that week, gradually, they will find their feet, drawing on the resilience they have developed through their primary school years.
Although there is convincing evidence that spatial skills are a reliable predictor of mathematical achievement in preschool children and in university students, there is a lack of research exploring associations between spatial and mathematics achievement during the primary school years.
"A large number of studies have found that quantity and quality of parental (and teacher!) verbal interaction impacts not only language development long-term but also measures of non-verbal intelligence and working memory in the mid-primary school years".
I told her about being adopted as an infant, about growing up near Copenhagen, my childhood fishing trips with my father to the Faeroe Islands, my primary-school years spent in Sweden.
In another letter from prison, Jianguo described those primary-school years as "uneventful," aside from a vivid memory he has of a great summer storm that struck while he walked back to school one Sunday afternoon.
She asked me how long I'd been in France, and I gave her my usual line: "Long enough to feel like an exile, not long enough to feel French". I told her about being adopted as an infant, about growing up near Copenhagen, my childhood fishing trips with my father to the Faeroe Islands, my primary-school years spent in Sweden.
