Looking for some suggestions

I have not had a training plan.  I've been doing as much as I can, when I can in order to get ready for an OLY next month.  I feel like I had been doing well to divide focus between the three events but then it seems I started spending more time swimming because I wanted to be sure I could complete the mile swim.  I feel confident about completing the swim now and I'm going to guess that I'll do it in around 35 min.  However, I realize that I have to put more time into the bike and run. 

I want to ride 4 nights over the next 2 weeks and then do a longer ride on the weekend.  I'm thinking of doing 18 mile rides followed by 3 mile runs on the treadmill.  Will doing these distance bikes and runs help me (assume I'm going to be pushing to go faster, or with an increased HR) or should I be more focused on longer distance bikes and runs?  The main reason for suggesting this is that it gets dark earlier but I know I could get an 18-20 mile bike in (actual OLY course too) and get home to run on the treadmill.  I find it difficult to run as far on the treadmill as I can run outside because I get bored.

Suggestions on what to do differently?  One reason I thought this may work is that there are two big hills on the way to the actual OLY bike course and I'll get to work on the two very steep hills on the OLY course too.

Mon    Swim A.M. 1500 yd mixed sprint sets     bike 18.75 P.M.    run 3 mile P.M.
Tue                                                                   bike 18.75 P.M.    run 3 mile P.M.
Wed   Swim P.M. 1500 yd mixed sprint sets
Thur                                                                  bike 18.75 P.M.    run 3 mile P.M.
Fri      Swim A.M. 1500 yd mixed sprint sets      bike 18.75 P.M.    run 3 mile P.M.
Sat                                                                    bike 32 mile
Sun    Swim 1650 trying for PR                                                      run 6 mile