Desk research against primary sources. Figures are traced to the issuing UAE authority and linked on the page.
Whether a payment plan exists is a school-level policy rather than a Dubai-wide right, so the answer changes from one school to the next and sometimes from one enrolment year to another at the same school. Ask the finance office directly rather than the admissions team, since admissions staff are often not the people who actually decide whether instalments or post-dated cheques are accepted.
A deposit or guarantor requirement attached to a deferral is worth reading closely, because it usually means the school can draw on that security if a later instalment is missed, not only if the whole year goes unpaid. Withholding a child from class or exams over unpaid fees is a real consequence schools can apply, so treat any agreed plan as a firm commitment rather than a flexible fallback.