I am going to buy a very thick university books of science.

Which subject should I buy?

Biology, physics or chemistry?

Which book do you have? Can you suggest some good books to me?

Please lower than 35GBP

What will be the purpose of the books you wish to purchase?

Act like as a self-taught reading books.

It is different from those lack of further study text books.

Well, unless you're moderately to very good in Algebra and Calculus, don't get the physics book. At least not yet till your maths are in order of being at least semi-useful in Physics.

 

I vote for Biology.

There's a very good undergraduate book called the Elements of Physics, the author escapes my mind atm, but it covers more or less all of the first year undergraduate course.

 

Warwick's Physics department uses this book for a lot of their courses. There's also a rather nice book called "Space, Time and Quanta" which is an introduction to quantum mechanics and also covers some special relativity.

 

How about this one?

How about going along with MIT's OCW?

 

Then, base your textbook selections upon their recommended books.

 

In addition, you may get some notes, assignments, practice quizzes/tests, and whatnot.