I'd recommend "Flowers for Algernon" by Daniel Keyes. It's about a young boy called Charlie who, following intelligence enhancing surgery, transforms into something of a genius. The surgery part is the only sc-ifi element in the book. There are no space ships or future wars.
The whole book is written in the first person and documents his emotional awakening. Back in the 90's, the book was frequently 'challenged' in the US due to its sex scenes. (Totally tame by today's standards... and indeed, by 90's standards.) But this is rightfully a classic.
A very moving and profound book.
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