My favorites are Casella and Berger: https://books.google.com/books/about/Statistical_Inference.html?id=0x_vAAAAMAAJ https://books.google.com/books/about/Statis

My favorites are Casella and Berger: https://books.google.com/books/about/Statistical_Inference.html?id=0x_vAAAAMAAJ https://books.google.com/books/about/Statistical_Inference.h... and Hogg, McKean and Craig: https://www.pearsonhighered.com/program/Hogg-Introduction-to-Mathematical-Statistics-7th-Edition/PGM49624.html https://www.pearsonhighered.com/program/Hogg-Introduction-to... They are both good books. The first one is more rigorous, but the second one covers more breadth and I think has better exercises.