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by ElectricMind 1950 days ago
I suggest this book

https://www.goodreads.com/book/show/1038863.Smart_Thinking

I am strong believer is if you can write well then you can think well. Both are interelated. Also you must play interactive role with nephew to make progress on critical thinking. Reading a books or 100 even is not useful if there is no dialogue, questions , challenges , debate or even summary. Critical mind don't accept anything without breaking it apart and tasting through fire. I hope this helps :)