UPSC Indian Statistical Service • Batch 2027
The test series that
built ISS toppers
4 phases. ~190 items. 12 months of structured preparation. All 6 papers covered — with subjective answer evaluation and copy checking. From diagnostic to full UPSC simulation.
~190
Practice items
6
Papers covered
110+
Daily DPPs
28
Full mocks
From our students
Proven by ISS toppers
Our current batch students cleared ISS. Here’s what they say.
“The 4-phase system made my preparation systematic. DPPs built my consistency and FSP mocks felt like the real exam. Couldn’t have done it without StatChakravyuh.”
“The subjective copy checking was a game changer. Getting feedback on my Stats III and IV answers helped me understand exactly what UPSC expects. Worth every rupee.”
“Official Statistics DPPs were a lifesaver — nobody else covers this properly. The RCP speed rounds improved my Paper I and II accuracy dramatically.”
Why us?
Built for ISS. Not adapted from GATE.
Most test series are repurposed GATE content. StatChakravyuh is designed ground-up for the ISS exam pattern.
Subjective answer evaluation
Stats III, Stats IV, GE, and GS copies manually checked with detailed feedback. Know exactly where you lose marks.
All 6 papers covered
Stats I-IV (Objective + Descriptive), General English, and General Studies. Complete coverage, not partial.
Stats IV — all 7 optionals
Explore all 7 optional sections in DBP before choosing your 2. OR, Demography, Survival, QC, Multivariate, DOE, Computing.
12 months of coverage
July 2026 to June 2027. Content releases progressively — you never have to cram, you build consistently.
Exam structure
6 papers. 1000 marks. We cover all.
Our priority: Objective papers first (screening), then Descriptive, then General.
| Paper | Subject | Type | Marks | Priority |
|---|---|---|---|---|
| Paper 1 | General English | Subjective | 100 | P3 |
| Paper 2 | General Studies | Subjective | 100 | P3 |
| Paper 3 | Statistics-I | Objective (80 Qs) | 200 | P1 |
| Paper 4 | Statistics-II | Objective (80 Qs) | 200 | P1 |
| Paper 5 | Statistics-III | Descriptive | 200 | P2 |
| Paper 6 | Statistics-IV | Descriptive (2/7) | 200 | P2 |
| Total written | 1,000 |
The 4-phase system
Practice • Improve • Repeat
Each phase builds on the previous one. Start from where you are, finish at UPSC level.
Phase 1
DEP
The benchmark
FREE
12 diagnostic tests
All 6 papers covered
Identify weak areas
4 Stats I + 3 Stats II + 3 Stats III + GE + GS
All 6 papers covered
Identify weak areas
4 Stats I + 3 Stats II + 3 Stats III + GE + GS
Phase 2
DBP
Consistency
₹1,999₹999
~110 Daily Practice Problems
6 milestone tests
All 4 Stats papers + GE/GS
All 7 Stats IV optionals covered
6 milestone tests
All 4 Stats papers + GE/GS
All 7 Stats IV optionals covered
Phase 3
RCP
Agility training
₹4,999₹2,999
~43 advanced tests
Subjective answer evaluation
Topic-wise + mixed + speed
PYQ-style + mini mocks
Subjective answer evaluation
Topic-wise + mixed + speed
PYQ-style + mini mocks
Phase 4
FSP
The pressure cooker
₹3,499₹1,999
~28 full-length mocks
PYP + New papers
Subjective copy checking
Grand simulation events
PYP + New papers
Subjective copy checking
Grand simulation events
What you get
~190 items across 12 months
Every paper, every section, every optional — systematically covered.
DEP (12)
DBP (~116)
RCP (43)
FSP (28)
| Paper / area | DPPs | Tests | Mocks |
|---|---|---|---|
| Stats I — Probability, Methods, Numerical, Computer | 30 | 10 | 8 PYP + 4 New |
| Stats II — Linear Models, Inference, Official Stats | 25 | 10 | 8 PYP + 4 New |
| Stats III — Sampling, Econometrics, Applied Stats | 22 | 8 | 2 New |
| Stats IV — 7 optional sections (choose 2) | 20 | 7 | 2 New |
| General English — Essay, Precis, Comprehension | 3 | 2 | Included in grand sim |
| General Studies — Polity, History, Current Affairs | 3 | 2 | Included in grand sim |
| Speed rounds + PYQ-style + Mini mocks | — | 10 | — |
| Grand simulation (2-day, all 6 papers) | — | — | 2 events |
| Total | ~105 | ~43 | ~28 |
Pricing
Premium preparation. Fair pricing.
Includes subjective copy checking — a service most test series don’t offer at any price.
Foundation
DEP + DBP + RCP
Diagnostics + 110 DPPs + 43 advanced tests + subjective evaluation. Foundation to exam-level.
₹3,998₹3,499
Save ₹499
Best value
Complete Chakravyuh
All 4 phases + Formula Book + subjective evaluation + copy checking + grand simulation. ~190 items. Everything included.
₹5,997₹4,999
Save ₹998 + Free Formula Book
Mock master
RCP + FSP
43 tests + 28 full mocks + subjective checking + grand simulation. For those who have basics covered.
₹4,998₹3,999
Save ₹999
Early bird — first 50 students
Complete Chakravyuh at ₹3,999 instead of ₹4,999. Save ₹1,000 extra. Limited to first 50 enrollments or first 2 weeks. Current batch toppers’ referral = extra ₹300 off.
Timeline
July 2026 → June 2027
12 months. Progressive content. Launch right after the ISS 2026 exam.
July 1, 2026
Launch day
DEP (12 tests) + first 15 DBP DPPs + bundles go live. Early bird pricing active. Toppers’ testimonials featured.
July — February 2027
DBP DPPs release weekly
2-3 DPPs/week. Stats I + II first (Objective priority), then Stats III, Stats IV, GE/GS. 6 milestones along the way.
August — September
ISS 2026 results announced
Social proof wave. Toppers’ ranks + testimonials go live. Second promotion push at regular pricing.
October 2026
RCP goes live
Topic-wise advanced tests + subjective evaluation begins. Mixed sectionals and speed rounds through January.
February 2027
FSP goes live
PYP papers first (Feb-Mar). New mocks weekly (Apr-May). Copy checking for all descriptive mocks.
May 2027
Grand simulation
2 full-day simulations. All 6 papers. Exact UPSC timing. Final rehearsal = 1 week before exam.
June 2027
ISS 2027 exam
You are ready. All ~190 items completed. Go become an Indian Statistical Service officer.
FAQ
Common questions
How does subjective answer evaluation work?+
For Stats III, Stats IV, GE, and GS papers — you write your answers, upload them, and our evaluators check your copies manually. You get detailed feedback on presentation, accuracy, and UPSC-expected answer structure. Turnaround: 48-72 hours.
Which Stats IV optional sections should I choose?+
DBP covers all 7 sections (2-3 DPPs each) so you can explore before deciding. Most popular combinations: (v) Multivariate + (vi) DOE, or (i) OR & Reliability + (vi) DOE. But try them all in DBP before locking in.
Is GE and GS also covered?+
Yes. GE (essay + precis practice) and GS (polity, history, geography, current affairs) are covered in DBP with DPPs, in RCP with full practice tests, and in FSP through grand simulation events. These papers are often neglected but they carry 200 marks.
What’s the grand simulation?+
Two full-day events where you attempt all 6 ISS papers over 2 days with exact UPSC timing. Live, scheduled, with ranking. Descriptive papers are copy-checked and returned with feedback. The closest thing to the real exam.
Why is the price higher than JAM/GATE batch?+
Three reasons: (1) Subjective copy checking is manual, expert-driven work. (2) ISS is a UPSC-level exam requiring deeper, more nuanced content. (3) We cover 6 papers including GE/GS, not just statistics. The pricing reflects the service quality.
Can I start with just DEP (free)?+
Absolutely. DEP is free and covers all 6 papers with 12 diagnostic tests. Take them, see where you stand, then decide. No pressure, no payment needed.
Your ISS journey starts with one diagnostic test
Free. No commitment. See exactly where you stand across all 6 papers.
Start FREE diagnostic →