there was just NOTES and NOTES and LABS and LABS. Jeeeez
Definitely!
Your advisor will probably suggest not taking more than one lab class at once, and then sign you up for two or three per term. A lab can be like taking an additional course.
The nice difference between what you've done and what you plan to do, is that some of the people in your class really want to know the information, not just finish the course. One of my Chemistry friends found permission to use the lab to work on his own experiments.
It sounds like you might have taken some Advanced Placement courses. If so, notice that you might have taken them stretched out over a year, where a college will put them into a 10-15 week block.
The content for AP is very regulated, so one (ethically) should not be harder information than the other. But a high school teacher will work very hard to make sure their students succeed, and will make more of an effort to design material in a way that students will absorb it.
If high school students do poorly in testing, then that reflects poorly on the HS, and discourages students from taking AP again. The program disintegrates. If college students do poorly in testing, the low grades help weed out those who might not be able to successfully complete future classes. There is still a concern over attrition, but the college appears more rigorous and competitive when not everyone succeeds.
College testing is internal; AP testing is standardized across the nation. Normal high school courses are internal but nationally standardized for content. Colleges determine their own content, except when programs come under certifying agencies like ABET... business, engineering, nursing, etc.
I know this wasn't exactly what you're asking, but it all plays into what you could expect. Get lots of sleep, and value your time and health. What you do for your body and mind will pay off or cost you, when demands don't let up.
It's great that you've worked hard so far -- in addition to having good grades, you have all of that knowledge as a foundation for the next set of information! The more you learn now, the easier it will be later.
If you're worried about fall, grab a used textbook from a garage sale or Craigslist, and skim it. Or go to Google Books Beta, Amazon Search Inside and read the table of contents. Or order your books early, and get a visual overview. Just establishing a comfort level with the book can help alleviate stifling fears, and make you feel more confident with the material.