Hello Vampiress,
The total number of lessons is for the entire High School program, meaning that when you are done with those 134 lessons and all of them have been passed and graded, you will be a High School graduate.
There should not be any Proctored Exams at the High School level. You will have final exams in some classes and graded projects in others; but these are not Proctored. Which means they are not administered in person.
Best of luck with your remaining studies!