There are six places left in the final and two challenging rounds ahead: spelling and general knowledge.
Being tested on some of the hardest words in the English language, and on a vast range of topics from astronomy to geography is pretty daunting, how will the kids cope?
Sophie is 11 and her dinner lady mum takes a relaxed approach to her child's intelligence. There's also 11 year old Eleanor – can she hold it together? And will eight-year old Tudor's many hours of supervised preparation be enough to guarantee him a place?
Child Genius, Channel 4, 9pm
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