How do I spend or manage the last week before prelims 2017?

I think you should concentrate on three things.

1. Revising the factual questions that might come in the exam. These include things like the name of the major and minor plates, Kharif and Rabi crops, things from history etc. Conceptual parts, if you have studied well, needn’t be revised in this last week.
2. Attempting some question papers: Attempt question papers in an exam setting. You should attempt a question only if you would have attempted it in the real prelims. This will help you assess how to do it in the exam hall.
3. Correcting your sleep cycles: Students tend to sleep late in the night. If you try to sleep early the day before the exam, you might find your body not able to do it. Try to come back to a normal circadian rhythm in the last week before prelims. Rest your body properly and be in a positive mindset.