u/Aggravating-Eagle374

I missed this year's PCS by few marks as I was not prepared well and was my first attempt. How can I be fully prepared for the upcoming PCS as I don't want to leave any stone unturned . I have never attempted UPSC due to no preparation. Should I start prep for UPSC and then give PCS when it comes. Any idea when will the next PCS come ? I am a Class C govt employee and want to be an officer. Kindly share your valuable insight regarding total time for full prep and way ahead.