Rhythm that does not follow formal patterns is called

cadence rhyme or normal rhythm

Cadence Rhyme

Explanation:

1 a : a rhythmic sequence or flow of sounds in language b : the beat, time, or measure of rhythmical motion or activity 2 a : a falling inflection of the voice b : a musical chord sequence moving to a harmonic close or rest 3 : the modulated and rhythmic recurrence of a sound especially in nature.

depends on your school

when i was in high school i took ap biology my senior year and it was the hardest one for me because my teacher finished the material within the first month of school and then went on to doing advanced college level it was horrible. but at a nearby school ap biology was one of the easier aps. also, it depends on what you are interested i like math a lot so ap calculus was easier for me than most but i hate history so ap us government was harder for me than most.