IF you are a freshman in HS (as the above poster believes) then please take one year at a time. It is too early to worry about what classes you might take senior year. See how you do over the next two years before you decide on a senior year schedule.
IF you are a junior then I would tell you to talk to your teachers and guidance counselor to work out an overall schedule that makes sense for you. You have given no indication of the classes you are taking now and how you are doing. For some students 6 APs is very manageable (especially since AP Psych and AP Stat are regarded as easier APs) and for others it would be overwhelming.
And FWIW you should not be decreasing your EC involvement senior year – in fact senior year can be the time when students are most involved with ECs as they are often in leadership positions by then.