Not directly, no. You can come in and truly learn the concepts with which you struggled and that will ensure better future test grades. Some teachers might give you an opportunity to correct tests or even to retake tests altogether. While this is an awesome opportunity, it does not prepare you for the challenge of college. Prepare for the test so you can do well the first time around.
With an online component, you get instant feedback and can correct yourself right then and there — while it's fresh. Also, the teacher can focus on teaching more and grading less. This is one of those challenges that this course will present to you. You need to overcome this. If you demonize online work, it will be harder to do well on it. If it helps you, write the problems down on paper, work them out on paper, and then plug your answers in.
If you love what you do, you usually smile while doing it.
Welcome to junior/senior year. Develop a system for staying on top of things. For me, I keep everything I have to do organized by using a free site/app called Todoist to manage all the tasks I have to do. Making lists help me to feel in control. Give it a try.
Ooof. That's kinda different for everyone. What do I do? I'm a bit of an introvert, which means I recharge by spending time away from people for a while. Sometimes, I'll go for a drive or head to Panera to read or grade. Spending time with my family is a big de-stresser. But everyone has a different trick - you just need to figure it out by trying different things.
I use Keynote for the slides in my classes and for the YouTube videos. Keynote is Apple's presentation software. You need an Apple device to run Keynote and to present in Keynote. I think it's $10 or so for the software.