If you are a 26-year-old working in IT services, reading this in January and wondering whether September is close enough to start worrying, the honest answer is that September is exactly the problem. The ISB application timeline that works for a working professional runs about eight months backwards from the Round 1 deadline, because the applicants who submit a calm, specific file in September are rarely the ones who began in July. This post lays out that calendar, month by month, for the PGP.
The ISB application timeline anchors you cannot move
Work backwards from the official dates. For the Class of 2028 cycle, the ISB deadlines page lists Round 1 on September 20, 2026, Round 2 on December 6, 2026, and Round 3 on January 17, 2027. ISB says the online application opens roughly two months before each deadline, and a late submission slides into the next round rather than being rejected.
Dates for the following cycle are published later, so treat the pattern as your planning assumption and confirm on the ISB site before locking anything. Our round-by-round breakdown covers the current cycle in full.
The eligibility page fixes the other hard constraints: a test-centre-based GMAT or GRE score no older than five years, at least 24 months of full-time work experience, and two mandatory essays of 400 words each (leadership, and learning approach) plus an optional 250-word essay. There is no minimum score. That last point is why a 6-month GMAT sprint is a choice, not a requirement.
January to March: decide, benchmark, and start the test
January is for one decision and one baseline. The decision is whether ISB is your target at all, and whether you are applying to the PGP, or a different format if you have more experience. The baseline is a full-length diagnostic GMAT or GRE, taken cold, so you know how far you are from the range you want.
AdmitStreet's 12-month schedule suggests starting test preparation 12 to 9 months out and puts typical prep at 3 to 6 months. That fits a working professional: January diagnostic, February to May of structured prep. Our own note on where the GMAT bar sits will help you set a target score instead of chasing a vague "as high as possible".
Week by week, January weeks 1 and 2 are the diagnostic and a prep plan. Weeks 3 and 4 are the first study block. February and March are steady prep with one full-length test every second weekend. No essays yet.
April to June: finish the test, then open the story
Book the real exam for May or early June so a retake still fits before the deadline. ISB allows unofficial scores if the test is taken on or before the deadline, but do not plan to rely on that provision. Finishing the test by mid-June is the single biggest stress reducer in this calendar.
Once the score is in hand, start the part most applicants underrate: the story. List every project, promotion, failure and team conflict from your last four to five years. Do not write essays yet. Write raw notes, one page per episode, and mark which ones show leadership and which show how you learn.
July to August: essays, recommenders, and the resume
July is for the two 400-word essays. Draft the leadership essay first, then the learning approach essay, and leave each untouched for two weeks before editing. If you are unsure how the admissions committee reads your background, our piece on how the adcom reads a resume shows what gets noticed and what gets skimmed.
Brief your recommenders in the first week of August. AdmitStreet advises contacting recommenders about three months before the deadline, which is early, but a recommender who has had six weeks writes something specific. Send them a one-page note with the two or three episodes you want them to speak to, so the letter and your essays corroborate each other instead of repeating each other.
By the end of August the resume, transcripts, and work-experience details should be ready. ISB asks you to document every role, designation, duration, and compensation, so start collecting offer letters and payslips now.
September: submit before the last week
The application form opens roughly two months before the deadline, which means early-to-mid July for a mid-September Round 1. Fill the form in sections as you go. In the first two weeks of September run a final essay pass, upload the test report, and submit a few days before the deadline, not on the last night. Then start interview preparation immediately, since Round 1 interviews run from the second week of October.
If you are an IT services engineer with a strong score but thin leadership evidence
Your calendar should be skewed toward April to June. The GMAT is probably the easy part; the harder work is finding two or three episodes that show ownership beyond your delivery role. Spend the notes phase interviewing yourself and a colleague. If nothing credible emerges by June, the honest move is Round 2.
If you are a non-engineer or a reapplicant with a few weeks to spare
A non-engineer from a commerce or arts background may want extra quantitative prep, so push the test start to January week 1 and add a month to the plan. A reapplicant faces a different problem: you have to show what changed. Start the story notes in the first half of the year, and read the reapplicant guidance in our ISB PGP admissions guide before drafting.
Common questions
When should I start preparing for ISB? About eight to nine months before the deadline you are targeting, so January for a September Round 1. If your GMAT is already done, you can compress to four to five months, but not below, because recommenders and essays need time that cannot be hurried.
Is Round 1 better than Round 2? ISB states the bar is the same across rounds, but a rushed Round 1 file is weaker than a considered Round 2 file. Choose Round 1 only if the test score, the recommenders, and the essay narrative are all ready by mid-August.
How long is a GMAT score valid for ISB? ISB asks for a test-centre-based score no older than five years, so an older score from an early-career attempt may still count.
Can I submit before my official score arrives? ISB accepts unofficial scores if the test was taken on or before the deadline, with the official report following from the testing agency.
What this means for Indian applicants
The calendar above is not a promise of admission; it is a way of making sure the file you submit reflects your real profile instead of a three-week scramble. The most common failure we see is a strong candidate who compresses essays and recommenders into August because the GMAT ran late. If you want to know whether your current numbers justify aiming at Round 1, a profile evaluation is the quickest way to find out, and our MBA and MiM consulting team builds round-by-round plans around it.
Related reading
Sources verified 2 October 2026. ISB dates for the next cycle are not yet published; next review 1 January 2028.