You should make efforts to prepare effectively so that you can match the examiner's expectations.
Understand the complete exam-plan and related requirements at each stage of examination.
Self-analysis will help you spot your strength and weaknesses; accordingly, prioritize the areas that need immediate attention.
As you have limited time to prepare for Civil Services Examination 2016, you should make best use of time available. As you mentioned, you are preparing after a long gap, being abreast with current affairs and contemporary developments would be beneficial.
It would be nice if you have someone to guide you as you don't have much time in hand for trial and error. Better, join any coaching institute of repute for help.
It will require great effort to cover such a huge syllabus and managing study-plan.
Commit yourself for slog and God-willing, you will be able to put up a good show.
All the best!