So Math 1AA3 is the continuation of Math 1A03 and it's the second calculus course mainly designed for science students. Compared to Math 1A03, which is mostly review from highschool (except integrals), Math 1AA3 definitely need more time to understand and get a good grasp of the materials (especially sequences and series, which was totally new to me).
This course has a pretty simple marking scheme: 10% assignments, 2 x 20% midterms and 50% exam. Like Math 1A03, if you score higher in the exam, your exam becomes 100% (I'm not sure if they will continue to do this so check).
Assignments
There were a total of 5 assignments, which they give you plenty of time to work on them (more than 2 weeks). You get multiple tries (like 5??) so it is not hard to get a perfect on all the assignments. I suggest trying the assignment questions after you finish all the recommended homework problems from the textbook as they tend to be more difficult.
Midterms
So there are two midterms and you are given 1hr to write each. If you do all the homework problems, you won't have any problems with the midterms. Most of the questions look very similar to the practice problems and the problems the professor go over during the class. Like many other courses, practicing solving problems is very important. Be careful on multiple choice questions as you don't get any part marks for showing your work. So check to make sure your answer is right and that you circled the right one (might sound silly but it can happen
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Exam
Exam consisted of 12 multiple choices and 5 long answer questions. I actually found the exam very fair and straight-forward. It concentrates more on the materials covered later in the year (parametric/polar curves and multivariable calculus) so make sure you over all the assignment and textbook problems. You are given 3hr to write it but you really need about 2hr and so you can use the remaining hour to go back and check your answers.
Instructor
I had Dr. Nicas as the instructor (he was also the course coordinator) and he was just awesome. Little jokes he throws here and there during the lectures are so funny. His lecture pacing is very good and he updates the website frequently and up-to-date. He also posts up the solutions to the midterms after the midterm so you can check your work. If you have questions, don't hesitate to ask for help during his office hour.
Overall
I really liked how the course doesn't cover so many materials but takes enough time to explore one topic in a great detail (pretty much, there are just 5 main sections in this course - improper integral, differential equations, sequences and series, parametric/polar curves, and multivariable calculus). The course is designed so that you will do great if you do all the homework problems and take sufficient time to understand the materials. Af first, topics like sequences and series can be very difficult but after you take some time to go over the notes and do the practice problems, you'll find that it's not so difficult after all. Some topics are really interesting as well (like for example, you get to draw pretty graphs that look like a heart or a flower). If you liked Math 1A03, I don't see why you won't like this as well.
Good luck!