If you didn't have CSI for your year as student that is unlikely to count towards your PR. Your five years working should count ok for PR. From the date of PR acquisition it is one year until you can apply for BC. UKVI normally tell you what date you can apply. So the answer to your question is "no...

Hi everyone I am very sorry if this has been addressed elsewhere - I did a search but couldn't find something. Here is my backstory: I am Greek, I've been in the UK for exactly 6 years (since Sep 2011). For the 1st year (Sep 2011 - Sep 2012) I've been a student. For the next 5 full years (Oct 2012 -...