"most difficult" is a personal thing. What you find most difficult someone else might find easy and also, the other way around.
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No. Chances are it will be the other way around: if you are bad at math, you stand a good chance of failing calculus or linear algebra. You will perform best at calculus and algebra if you have a strong math background.
algebra
Algebra and calculus
Different subjects of math (e.g. algebra, geometry, algebra, number theory, calculus) that are integrated, or combined together.
algebra, calculus, arithmetic, etc.