Its harder than calc I. Calc I is only a few rules you can easily learn in a week, "precalculus" is all of algebra and trigonometry in one course. If you get an A in college precalc you can get an A in Calc I and II.
But you should not need precalc, you already took it according to your post... sometimes universities in the USA offer a specific pre-calculus course that isn't college algebra and college trig, and its a proof based course on trig identities and theorems in algebra. They go by many names like "algebra and coordinate geometry" or precalc as well. These courses are meant for students that did well in HS and maybe did AP Calc I, but aren't ready for university Calc I due to state standards being so low.
Remember that university exams are timed. If you're stumbling in a product rule problem with identifying trig identities, you're going to eat shit. Same with immediately recognizing limit values for trig functions, like f(x)= sin(pi/x), easy brainlet trap or timesink for clowns using a calculator. On the topic of calculators, they won't save you on infinite series or other problems that require analytical solutions, you'll just be spinning your wheels if you did not develop a strong foundation.
Your uni more than likely uses Stewart's book, go buy it and run through chapter 1. Should be able to do all of it in one sitting. If its an issue for you, take precalc. Better yet just ask your professor off the record. On the record they aren't allowed to give academic advising.
