the main books has already been mentioned by Mr.Asad.
haan u should see which edition of Miller and harley offers u more topics.4th or 5th.i have the fifth ed.pre-med books are very helpful.after that make a list of those topics that u dont find in these books,and make notes.it would be wonderful if u go to any library.here i will not recommend u any particular book because the basic facts are all the same in different books.u can consult khan Mohammad rafique's,Ilmi books are good,books on genetics and ecology.

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~Miss zoologist~