As a senior who is literally graduated later this evening, I'll tell you about my AP experience and what I suggest. As a disclaimer, keep in mind that depending on your region, school size, teacher, state mandates, or anything similar, your experience could be vastly different from mine. I'd also like to apologize for the gigantic size of this post.
I've taken 9 APs-- 1 in sophomore year, 3 in junior year, and 5 in senior year. This year--besides other mandatory courses like phys ed--I only took those 5 AP courses (no electives). What are your other 2 courses besides your APs? Also out of curiosity, what AP courses have you taken previously? And of your 6 APs now, are any of them half-year courses or all they all being offered as full year (2 semester) courses?
I won't tell you to not worry about staying focused, because worry is a good incentive here. Personally, through my own drive in addition to peer pressure, I was able to stay focused right to the day of the AP exams. The fact that you plan on buying AP prep books and looking at them before the school year even starts is a great sign, I think.
Filling out college applications is not as big a deal as many think it is. It only seems very time consuming because you spend more time thinking about it than actually doing it. If you are really motivated, you can fill out about 1-3 applications in a weekend (some colleges require a lot more writing than others, though). I would not let the idea of writing college apps get in your way; it will really only consume a few weeks of your time, and it will not significantly influence the amount of work you have to do in any way.
Depending on the clubs, you might want to drop one or two. If you have been in a club for your entire highschool career, colleges like that commitment, so I would recommend staying in those if you need every boost you can get for your college apps. Otherwise, clubs aren't that significant, unless they are for community service or really help you get into your career field of interest, and I would not let them get in the way of your real academic work. If the workload is too much, you can drop almost any club any time during school year; it's much more painful to drop an AP.
I wouldn't worry too much about AP courses being too difficult for you, meaning you won't need to apply yourself 100% all-year long. You'll find out, probably within the first few weeks, which APs you will need to focus on and which ones you don't need to work too hard on. I've only taken a few of the APs you will be taking in the fall, but this was my experience:
European History- not to scare you, but one of the hardest courses and exams I've taken, simply because the amount of content in the course is so vast. It might have changed a bit in the past 2 years, but probably not too drastically. If you start studying well in advance of the exam (at least a month before the exam date, study for like 15 minutes a day at first and ramp that time up as the exam gets closer) you should be fine, though.
US Government- on the other hand, one of the easiest courses and exams I've taken. I found this on par with some of the regular courses at my school; it was almost a joke. You will have to actually learn and pay attention (somewhat), but none of the concepts are difficult to understand or remember.
English Lit- an easy course for me, a moderately difficult exam. This is the most subjective subject out of all of them: some of the exam questions could be rewritten as "which of the following opinions is the correct one?". But the amount of material is nothing crazy and as long as you read some higher-level books you'll be fine for the essays.
To pass on what an intelligent adult that I respect very much told me, AP classes don't prepare you for college as well as normal classes. Most of them are project and group based, with normal classes being more study based
Personally, this has not been my experience at all (with some small exceptions). Almost all of the AP courses I took featured minimal group work, lots of solo note-taking and studying, and barely any projects. The majority of my AP courses also focused heavily on in-class lectures and/or reading a textbook outside of class to learn the course material.
Helmaroc, it is still a great advantage to taking AP courses even in senior year. First of all, colleges
will take your course load into account when making admissions decisions, even (perhaps especially) your senior year load. Slacking off in senior year, taking minimal and easy courses will characterize you as a poor and unmotivated student, while taking lots of APs and having great grades in addition will get you noticed. My AP load, the grades I got in those courses, and my past scores on AP exams definitely influenced getting accepted to my college.
However, I would recommend checking the AP policies of the colleges you plan on applying to. With high enough scores, some AP exams will exempt you from college courses or at the very least give you college credit: if my AP scores this year pan out, I could theoretically enter college with 30 credits and be exempt from several freshmen-year courses. But whether or not you can skip courses depends on the AP and your college major. Come next May (exam time) I would focus much more on getting high scores on the APs that can exempt you from courses because that will save you time and money.
Hope that helps!