Lucent Gk.pdf Page
Do not skip "World History" (it is small but high-yield for UPSC). You can skip very specific "Tax rates of 1991" (Economics) as those numbers are outdated.
Yes, for General Awareness section (Tier-1), Lucent GK + Current Affairs (6 months) is sufficient. For Tier-2, you need to supplement it with a separate Current Affairs magazine. Lucent Gk.pdf