<p>Figure out how many hours you're going to spend in class per week.</p>
<p>Now, estimate how many hours you're going to need to spend working outside of class. The general estimate is 2 hours outside of class for each hour inside class. Physics and English are both classes in which some students are going to be spending more than 2 hours outside class, but if you're good at those things you may spend less. Being able to do a week's worth of high school homework in just a couple of hours doesn't mean you'll be able to do that in college.</p>
<p>Recognize that in summer school things go very quickly (you're essentially doing a week's worth of class every day) and both of these are skill classes (rather than body of knowledge classes), so you won't be able to do all the work between Thursday and Monday -- you're going to have to be doing some of the reading and writing and problems during the section of the week when you're actually in class.</p>
<p>If you don't understand something, you're going to be spending some of that 90 minutes between class in office hours or talking to other students. And you're definitely going to need lunch. So while you can certainly do some of that work in between classes (especially if you have a laptop), I wouldn't count on doing all of it, even if you can get by with only 90 minutes of homework time -- and I wouldn't count on getting by with only 90 minutes a day for 4 days a week.</p>
<p>Then consider how sleep deprivation affects you. How many hours of sleep do you need a night in order to be able to concentrate for 9 hours of class plus several more hours of homework? If you get fewer hours than you need on Monday and Tuesday, how is that going to affect you on Wednesday and Thursday?</p>
<p>And also think about your ability to work when you don't want to. In summer classes (at schools with semesters, at least), it's much harder to recover from falling behind because everything is so compressed. Can you keep up even if it's hard and/or boring?</p>
<p>I am certain that there are some people who could manage to do what you're suggesting here. I don't believe that there are very many of them. And, especially if you are the kind of student who can do this (which would make you the kind of student who could take a heavy course load during the regular school year), I don't think "to be more prepared" is that great a reason. </p>
<p>Is there a specific program you particularly want to be in that would make it hard to do these classes during the school year? Are there specific classes you especially want to take that have these as prereqs? Those might be good reasons to take them -- again, especially if you can stay completely focused with not enough sleep and are especially gifted in these areas. </p>
<p>Or are these classes that you expect will be difficult enough for you that you'd rather take them at a less rigorous school than UCSD? If that's the case, I'd suggest taking only one, and whichever one you will depend on less in your program of study because the other one is where you'll really want the better preparation even if it's hard.</p>
<p>But if you are used to being a bit "ahead" of everyone else and you want to continue that in college and that's your main reason, I wouldn't bother. I'd just have a great summer and read things that I wanted to read and think about things that interested me: I'd switch from focusing on having a broader education than other people to focusing on making sure I had a deeper education.</p>
<p>As has been pointed out, we don't know you. So we can't answer whether or not this is a workload you can handle or even whether it's a plan that makes sense for you. But this is what I would be thinking about if I were making the call for myself.</p>