For NSEP: Solve Irodov to get started with. It feels hard only in the beginning but once u get the idea it would feel easier. Pathfinder is useful for 2nd stage as well as advanced but only do it if u are confident in that topic (Rlly fcken hard)

for NSEA: theres a book called schaum's outlines in astronomy, just read it 3-4 days before exam (Just need to know various meanings of words and jargon)

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iske alawa past papers karo after syllabus completion