Why can't I write a nonfiction text analysis in 90 minutes?

Hello, I'm about to take a German exam in which I have to write an analysis of a nonfiction text. I've already practiced for it twice and have encountered a major problem: I simply can't finish my analysis within the allotted time of 90 minutes. I start by reading the text, after which I write…

Tutoring for German/biology non-fiction text. Is there an equivalent to an entomologist?

I don't know if counterpart is the right word here, but someone who deals scientifically with insects is called an entomologist, for example. Is there a similar term for other fields of research that deal with vertebrates? I don't know. "Mammalogist" sounds really vague, and "Animalologist" would be too general. But I can't find anything…