I do not know multivariable calculus. I have studied out of Apostol Vol.1. I do not want to learn the material from Apostol Vol. II. Therefore I want to know If it would be worthwhile to go through Hubbard and Hubbard's 'Vector Calculus, Linear Algebra, and Differential Forms' after going through Serge Lang's 'Linear Algebra' or would it be better to go through Serge Lang's 'Calculus of Several Variables' and then Baby Rudin followed by Spivak's 'Calculus on Manifolds'? Regardless, I am going to go through Baby Rudin and Spivak's 'Calculus on Manifolds' book, I really just want to know if it is worth the time to go through Hubbard and Hubbard or Lang's 'Calculus of Several Variables' or can I skip these and do Rudin and Spivak's book? Thank you for your helpful responses.