[Wyman]

What level calculus and what book? What book for linear algebra? What's your math background?

I don't think linear alg. is much more difficult than calc, but I think it requires you to think about things that you're not used to thinking about (if this is your first linear alg. course). Also some places teach it proof-based, which makes it seem more difficult than calc to students who haven't done proofs before.