You need to take any remaining P1~P3 papers concurrently with any optional papers so you would need to take like P1, P2, P3 and P7 together as replied by emokia..... that would be suiciding.
These are the lecturers I took from my previous modules; for your consideration, I think there are quite a few more popular one apart from those I signed up with too.
P1: AP Chee from SAA.
Good tips and exam focus
P2: Sami from LSBF.
Drill alot on questions, although you might need to read up more technical articles yourself. Sami is very "calculating and FRS based" so P2 suits him well but he tends to go easy on writing so you need to make up for that yourself.
P3: Andy from Kaplan.
To the point and take effort to mark your work (if you willing to do), 'force' you to keep current every week with quiz and recapping and linking earlier chapters. He doesn't write much so normally his class is easy going and ends on time.
P4: Esther from Kaplan.
I am not aware of any popular P4 lecturer so just go for Kaplan since the location is more convenient for me after work. However, it turns out that Esther is a very good lecturer, she manage to explain complicated concept in simple understandable way and her method is often very easy to apply.
P5: Roy Goh from LSBF
He writes alot and since they will send the class note to students, I usually never copy... just sit there listen and stone or day dream...

I think P5 you need to know the way to answer the question not so much of understanding the concept. Roy trains you for that, you will slowly change the way you look and understand a typical P5 question. Doing past yr questions help to build up on that question answering skill. *Yet to verify, let you know on 8th Aug*
No idea for P6 and P7 although the highest failure rate are from P5 and P7 with slightly over 30% passes.