My question is : What is a time effective way to learn new material/ reviewing old material you don't completely remember?
For my research in Computer Science, I need lots of elements of hypothesis testing that I learnt in Statistics 101 (Roughly 10 years ago). I haven't taken a single stats class ever since. I vaguely remember the terms involved in the subject and am somewhat conversant with the basics of statistics (so I don't need to retake the course). But all in all, it's as good as a blank slate right now.
I have read How to efficiently read mathematically and theoretically dense books in STEM fields? but that targets a specific topic that the OP wants to learn, not an entire book. The top 3 answers talk about reading only those sections which you are interesting in. I, on the other hand, need to understand the whole of hypothesis testing which by itself is a book.
My options are (As far as I can see):
Take out the book I used / "Best" book of the subject (i.e. the one best suited for my background) and read it from page 1 till I am comfortable. Too time consuming
Read the chapter I need and then go back to the terms I don't understand. Time spent in confusion and direction-less reading exceeds the time actually spent adding value.
Take course again/Read cover to cover. God No.
EDIT : I wish to add that I can sacrifice depth for familiarity and savings in time. (Is this a good idea but? Assuming that it's not a central part of my research)