Learn Farsi: بیشتر اوقات من در کتابخانه مطالعه می‌کنم. - Most of the time, I study in the library.

No, اوقات (ouqât) is an Arabic "broken plural" for وقت (vaqt), meaning "time". Instead of adding a regular Farsi plural suffix like ـها (ha), the word's internal structure changes. Because Farsi borrowed many of these Arabic plurals, you will hear اوقات very often in phrases like this, so it acts as the standard plural of وقت.

How does بیشتر mean "most" here instead of "more"?

بیشتر (bishtar) does mean "more" on its own. However, when you connect it to a plural noun using an ezafe (the hidden "e" linking vowel), it translates to "most of". Therefore, بیشترِ اوقات (bishtar-e ouqât) literally translates to "most of the times".

Why use مطالعه می‌کنم instead of درس می‌خوانم for "I study"?

درس خواندن (literally "reading lessons") is used specifically for studying school subjects, doing homework, or cramming for a test. مطالعه کردن (motâle'e kardan) is a broader and slightly more formal term that means reading books, researching, or studying in general. It perfectly fits the context of reading or doing general study in a library.

Why is the subject من placed after the time phrase instead of at the very beginning?

While you absolutely can say من بیشتر اوقات... (starting with the subject), Farsi word order is quite flexible. It is very common and natural to put time phrases like بیشتر اوقات at the absolute beginning of a sentence to establish the context before introducing who is doing the action.