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ar yr adegau hyn , dylai athrawon allu tynnu ar storfa o ddeunydd prawf wedi'u seilio ar egwyddor parodrwydd i brofi i'w helpu i gadw llygad ar ddatblygiad disgyblion
at these times , teachers should be able to use a store of test material based on the readiness to test principle in order to help them keep an eye on pupils ' development