What is “Marja” ?
Don’t sweat the math too much. Its just basic algebra, order of operations, solving for the unknown variable, conversion of minutes and seconds to decimal, and the properties of right triangles. For a near coastal license you won’t need to know trig much beyond memorizing SOH CAH TOA. You’ll need to learn how to use the same scientific calculator used in your classes. There are quite a few formulas to memorize. If you are going for an ocean license, there are a lot of different ways to get to the same result in celestial and the sailings, some involve the use of tables, others rely on formulas and calculators. You’ll need to learn whichever way is taught in your class.