Primary and Mass Education Secretary Akram-Al-Hossain confirmed the matter and said they have received approval from Prime Minister Sheikh Hasina in this regard on Thursday.
The children would have to begin the pre-primary learning at 4+ years of age instead of 5+ years, he said.
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The government took the decision as pre-primary education is directly connected to children's dropping out rate in country, Hossain said.
School dropout rate reduced significantly during 2010 to 2019 after launching one year pre-primary learning system, according to Annual Primary School survey, he added.
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