⚡ TL;DR

All six follow UPSC's 3-stage structure (Prelims → Mains → Interview) and reward an aspirant who has built strong GS fundamentals. But each has its own quirks — UPPSC has scrapped optional and added UP-specific papers (GS V & VI); MPSC has gone fully descriptive with 26 optionals; BPSC 71st CCE 2025 had a one-paper prelims with no CSAT. Pick the one matching your domicile or willingness to learn the state's language.

Quick comparison snapshot (verified for 2025-26 cycles)

ExamPrelimsMainsInterviewLatest change
BPSC 71st CCE (2025)1 paper, 150 MCQs / 150 marks, 2 hrs, 1/3 negative — no CSAT4 merit papers (Essay, GS-I, GS-II, Optional) + General Hindi qualifyingYesNotification May 30, 2025; ~1,250 vacancies; Mains scheduled Apr 25–30, 2026
UPPSC PCS2 papers (GS + CSAT), 200 marks each, 1/3 negative8 compulsory papers, 1,500 marks; optional removed; 2 new UP-specific papers (GS-V & GS-VI on UP history, culture, economy, geography, current affairs)100 marksOptional scrapped; total 8 compulsory papers now
RPSC RAS1 paper, 200 marks (MCQs), qualifying; 1/3 negative4 descriptive papers × 200 marks = 800100 marksRajasthan Examination Act, 2022 syllabus updates incorporated
MPSC RajyasevaGS + CSAT (200 each); CSAT qualifying at 33%9 descriptive papers, 1,750 marks total; Marathi/English qualifying (300 each); 7 merit papers × 250 marks; optional restored — choose 1 from 26YesShifted from objective to fully descriptive; closest in spirit to UPSC
TNPSC Group 1200 MCQs × 1.5 = 300 marks, 3 hrs4 papers — Paper-I Tamil eligibility (100 marks, qualifying at SSLC standard); Papers II–IV are GS at degree standard, 250 marks each100 marksPapers II–IV evaluated only if Paper-I qualified
KPSC KAS2 papers × 200 marks, 0.25 negative9 papers, 1,750 marks; Kannada & English qualifying (150 marks, 2 hrs); 7 merit papers descriptive50 marksMains held May 3, 2026 cycle (recent)

Domicile reality

Most state PCS cycles reserve 70–95% of vacancies for state domiciles under "Bihar resident", "UP resident", "Mulnivasi Rajasthan", etc. Always read the eligibility section of the notification before mapping a state PCS as your Plan B — outsiders sometimes get only ~5% of seats and only in selected services.

Language barrier — be honest with yourself

  • Tamil Paper-I (TNPSC): SSLC standard, non-natives need 3–4 focused months.
  • Marathi (MPSC): Qualifying, but 300 marks; non-natives realistically need 5–6 months for confident answer-writing.
  • Kannada (KPSC): 75 marks within the language paper; very tough for non-Kannadigas without childhood exposure.

For most North Indian aspirants, BPSC and UPPSC are the path of least friction. For South Indian aspirants, KPSC, TNPSC, or APPSC depending on language.

Optional load — what is the cheapest second exam if you already do UPSC optional?

  • If your UPSC optional is PSIR, Sociology, History, Geography, Anthropology, Public Admin → MPSC accepts these, so your UPSC optional reuses 90%.
  • UPPSC no longer has optionals — Mains content is leaner but state-heavy. Net effort: ~3 months of UP-specific GS sprint.
  • BPSC 71st does have optional in Mains — same UPSC optional usually works.
  • TNPSC / KPSC Mains is GS-only at merit papers — no optional, but you do pay for the language paper.

Worked scenario: Bihar domicile, 2 attempts left, doing UPSC PSIR

Month-by-month split most of our mentees follow:

  • Apr–Aug: UPSC Prelims sprint (PSIR cold)
  • Sep–Dec: UPSC Mains sprint (PSIR full revival)
  • Jan–Mar: BPSC Mains sprint (reuse PSIR; build Bihar-GS through Bihar Year Book + state PIB)
  • Apr–May: Interview prep for both — heavy overlap

Result: two real shots in one calendar year, with ~85% study-hour overlap.

Worked scenario: Karnataka domicile, Kannada-medium aspirant, lost 3 UPSC attempts

  • KPSC KAS becomes the obvious primary (language is a strength, not a barrier).
  • TNPSC Group 1 as a second front if you speak Tamil; otherwise drop a second exam entirely.
  • Devote one full month (post UPSC Mains) to Karnataka-specific GS (history, economy, geography, polity through Karnataka Year Book).
  • Mains May 2026 cycle is the immediate target; verify dates on kpsc.kar.nic.in.

Vacancy snapshot (illustrative, verify each cycle on official sites)

ExamLatest reported vacancies (recent cycles)Typical fight
BPSC 71st CCE 2025~1,250 posts~5–6 lakh apply
UPPSC PCS200–400 posts/cycle~5–6 lakh apply
RPSC RAS700–900 posts/cycle~3–5 lakh apply
MPSC Rajyaseva200–400 posts~3 lakh apply
TNPSC Group 180–100 posts~5–7 lakh apply
KPSC KAS300–400 posts~2–3 lakh apply

BPSC and RPSC have the highest vacancy-to-applicant ratio among the big six — which is why North Indian aspirants without UP/Bihar domicile often invest in establishing Bihar/Rajasthan eligibility.

Mentor's note

Do not appear for all six. Pick one primary (usually your domicile state) and one secondary (a non-language-barrier one like BPSC for most North Indians, or KPSC if you're South). Three PCS exams in one year is how aspirants end up clearing none — calendars clash, syllabi diverge in the last 10%, and you become a tired generalist.

Sources

Ujiyari Ujiyari — Current Affairs