I should my one last try or not

It all depends upon your financial position,

If you have enough money that can help you till completion of course then definetly yes you should start

or allot specific time for studies along with work

remember having a professional degree will give strength to your work

Suggesting from my own experience 

It's my suggestion that go for ICAI webcast for different subjects & if you are in CA final, you should prepare for 1 group at a time. Always attempt CA exams with positive mindset. Always try for geeting an exemption so that even if you fail, you will not have to give that paper again. Always refer ICAI Module, PM, Suggested answers for last 10 attempts & RTP of last 6 attempts. You need not to spent any additional amount in coaching but if you want, then join CA final crash course organised by ICAI. Trust me, it will help you a lot. Just focus ,Get leave from your job & start prepare for CA exams as the prefix 'CA' will always give you respect & money at your workplace & Social life. It takes some time but the efforts are worthy. Best of Luck.