"We need five primary school students."

Translation: Kami memerlukan lima orang pelajar sekolah dasar.

[Rick392366]

We need five primary school students.
Meaning: Kami memerlukan lima orang pelajar sekolah dasar.

'murid' should be acceptable (reported).
'siswa' should be acceptable (reported).

[wolfe.mcbr]

'kami perlu lima pelajar sekolah dasar' is accepted

[Jspharmando]

Student (noun) = pelajar, murid, siswa (male), siswi (female)

University student (noun) = mahasiswa (male), mahasiswi (female)