Aa, i am in the same situation. i am working on the same hours and after the hectic day, its much difficult to even open the book. you have experience of preparation and exam but i don't have it either. although i am not senior, but one thing for sure bro, don't leave your job for css until you have someone financially supporting you. i think we people should make schedule of sleep and study after the 6pm. If after6 you sleep for 2 hours, you wil get your mind and body refreshed and prepared for 2,3 hours study. that's what i am trying to do now a days.