Undergraduate textbooks

There are thousands of undergraduate text books in all of those subjects. You'll need to specify your question/whatever further.

 

I don't know much about chem or bio, but for introductory physics textbooks I would go with Griffiths for Quantum and EM.

 

Chemistry
Chemistry: The Molecular Nature of Matter & Change by Silbergberg <---- General
Organic Chemistry by Wade

that's it for chemistry that I can recommend. Other usual topics are inorganic chemistry and physical chemistry but I'm not sure on which textbooks I'd recommend

Biology:
Biology by Campbell and Reece <---- General
Genetic Analysis by Griffiths, Wessler, Lewontin, & Carroll
Evolutionary Analysis by Freeman & Herron

If you want to learn undergrad level cell biology, then make sure you know some organic chemistry before moving on!! (also know some genetics)

Fundamentals of Biochemistry: Life at the Molecular Level by Voet, Voet, & Pratt
Essential Cell Biology by Alberts, Bray, Hopkins, Johnson, Lewis, Raff, Roberts, & Walter

Physics:
make sure you have a decent math background!!
Calculus, Linear Algebra, Vector Calculus, Complex Analysis, Ordinary Differential Equations, and Partial Differential Equations should be enough.

Fundamentals of Physics (Extended Edition) by Halliday, Resnick, & Walker <---- General
(note: this is a calculus-based introductory physics text which is really really good for self study IMO. Some people knock it for being too "elementary" or "watered" down, but I say for the autodidact it's best to take it one step at a time.)
Classical Mechanics by Taylor
Statistical Physics by Mandl (note: universities usually use Kittel or Schroeder, but I prefer this)
Introduction to Electrodynamics by Griffiths
Quantum Mechanics: Concepts & Applications by Zettili (note: QM by Griffiths is a standard among universities, but again, I'd have go with Zettili for self study)
Special Relativity by French
A First Course in General Relativity by Schutz (general relativity sometimes isn't covered in the undergraduate curriculum)


In case you'd like some math textbook recommendation as well (that aren't really rigorous) for undergrad physics

Math:
Calculus by Larson & Edwards
Elementary Linear Algebra by Larson, Edwards, & Falvo
Differential Equations w/ Boundary Value Problems by Polking, Boggess, & Arnold
Partial Differential Equations with Fourier Series and Boundary Value Problems by Asmar
Introduction to Vector Analysis by Davis & Snider
Fundamentals of Complex Analysis with Applications to Engineering, Science, and Mathematics by Saff & Snider


all of these books are easy to read and great for self study IMO