What marks (and ranks) are needed for IAS vs IPS vs IFS vs IRS?

For a General-category aspirant in 2024, IAS required a rank under ~78 (~1010+ total marks), IFS under ~107, IPS under ~252, and IRS-IT/C&CE within ~300. Top 1000 typically secures a Group A service; below 1000, allocations taper into Group B.