18th June? That's enough time to get to 580 - 600
Start with PR 2007. Should take you 10 days to finish if you have a full-time job with reasonable working hours.
Then do the Quant in NOVA and start with OG-V.
Keep revising concepts/ mistakes.
I suggest you take as much time off work as you can. Do this and you'll fly past the 600 mark