Ancient and Modern Mathematical Thoughts is a set of books worth reading, written by Klein, with four volumes in total. After reading it, you basically have an overall grasp of the branches of mathematics. He also has a book, Mathematics-Loss of certainty, which may be too philosophical. You can also watch.
"A Brief History of Time" is a very famous popular science written by Hawking. It introduces physics such as space-time, black holes and so on, and it is also very simple and thin.
Gamov's popular science books, including From One to Infinity and Adventures in the Physical World, are very interesting.
These are the first few books, but I don't know much about chemistry, so I won't introduce them.