Which IQ range is called trainable IQ level of mentally retarded children?

Mentally challenged or retarded children are traditionally classified into educational categories based on their functional capabilities and IQ scores:Educable Mentally Retarded (EMR): IQ range of approximately $50-69$. These individuals can acquire basic academic skills up to a late elementary level with special guidance.Trainable Mentally Retarded (TMR): IQ range of approximately $35-49$ (or $36-49$). These children cannot master academic skills but can be trained to develop basic self-care, communication, and occupational safety habits.Severe/Profound Mentally Retarded: IQ level below $35$. They require constant supervision and highly dependent support infrastructure.Therefore, the trainable IQ level corresponds to the range of $36-49$.