Same here, after a gap of 3 years.
My bet, is my own notes (atleast for static portion). I have already made a list of factoids / superlatives for prelims so it will save time.
For current use any of topicwise compilation (vision or insights). Attempt atleast 29 question everyday. And in last 2 weeks one full length mock (+ analysis) everyday.
Revise current notes twice before prelims. And ensure you revise factoids and superlatives one day before exams (eg SCO HQ in Beijing not Shanghai)
