.

Keeping this in view, is Trig before or after calculus?

The standard curriculum presents Trigonometry before Calculus. This is because Trigonometry is a good application area of calculus. You get lots of functions you can differentiate and integrate and use for examples. But the standard curriculum is wrong.

Secondly, what class should I take before calculus? The types of courses that a student should take prior to calculus vary according to whether the student is taking calculus in high school or in college. Typical high school prerequisites are pre-algebra, algebra 1, algebra 2 and pre-calculus.

Regarding this, is calculus easier than trigonometry?

It seems as though calculus applies trigonometric functions in the same way algebra does, i.e. it's a system of operations which doesn't depend on things like trig' in any way, but rather serves as a foundation/context for using trig'. Actually, it seems like basic calculus is easier than basic trigonometry.

Can you take pre calculus without taking trigonometry?

Yes, but can you take pre calc without having taken trig. At the high school level, yes, although exposure to basic right triangle trig in a geometry or algebra 2 class would help. If a high school offers precalculus, then they normally do not offer a separate trig course, but there are exceptions.