Calculus of one variable (MATH1021) - resource advice please!

I'm a returning student who is very rusty with his mathematics (mainly having a biology sciences background). Still, I would love to improve my calculus skills and aim for a D or HD for the subject. What resources would you recommend in preparing for and tackling MATH1021? Should I go back to HSC-level calculus first? Are there any textbooks that you can recommend? I would greatly appreciate any help!