Yes, you can. But that answer only matters if you use those 100 days the right way, because students who start late and still score well are not doing anything magical. They just stop wasting time on the wrong things faster than everyone else.

CAT has three sections: VARC, DILR, and QA. A 100-day plan has to touch all three, and it has to leave room for mocks, because mocks are not something you do at the end. They are how you find out if any of your preparation is actually working.

If you have 100 days left, the worst thing you can do right now is spend the next week mapping out a colour-coded study schedule. Take a mock first. An ugly, uncomfortable mock that shows you exactly where you are. That score is your actual starting point, not what you remember from school or college.

What those 100 days actually look like

A rough way to split it: spend the first 25 days building fundamentals, the next 25 days solving questions properly, the third block taking sectional tests and full mocks, and the last 25 days doing mocks back to back with serious analysis between each one. The reason for this structure is simple. Most students spend 70 or 80 days studying concepts and then panic when they have no time left for mocks. Mocks are not a reward for finishing your syllabus. They are part of the preparation itself.

The first 25 days are about knowing where the gaps are. In QA, that means going through arithmetic, percentages, ratios, time-speed-distance, algebra, geometry, and number system. Not to master them all, but to get a working level in each. In VARC, reading has to become something you do every day; editorials, long essays, anything with a real argument running through it. Para jumbles and RC passages should be part of your daily routine from day one, not something you save for later. In DILR, the goal early on is just exposure; you want to see enough set types, arrangements, tournaments, scheduling, distributions, that you stop feeling lost when you see an unfamiliar one.

Days 26 to 50 are where a lot of students quietly go wrong. They keep watching lectures because it feels productive. It is not. By this point your main job is to solve questions and then understand every single error. A conceptual mistake means you need to go back to the concept. A calculation mistake means you are being sloppy and you need to slow down. Getting the right answer but taking too long means you need a different approach. None of this happens if you just count questions solved and move on.

VARC in this phase is about reading with real attention. After every RC passage, ask yourself what the central argument was, what tone the author used, which options you could have eliminated faster. Accuracy here matters far more than attempting more passages. DILR in this phase is about learning when to abandon a set. You will not solve every set on exam day. The skill is knowing within two minutes whether a set is worth your time, and that instinct only comes from doing timed sets and reviewing your choices honestly afterward.

From day 51 onward, mocks are the backbone of your week. A full mock followed by proper analysis; not five minutes of glancing at wrong answers, but a real review of which questions you should have skipped, which sections you misread, which set looked unfamiliar and made you panic. Keep a notebook of recurring mistakes. Students who improve their mock scores consistently between day 50 and day 100 are almost always the ones doing this.

The last 25 days are not for starting new books. By then you should know which topics are your scoring areas, which mistakes keep coming back, and roughly how long you can spend per section before your accuracy drops. That self-awareness is what makes the difference on exam day.

How many hours per day

There is no single number. Someone rebuilding quant from scratch needs a different schedule from someone who is already comfortable with maths and just needs mock practice. A workable starting point is three to four focused hours on weekdays with more on weekends, adjusted for whether you are still in college or working. The word "focused" is doing real work in that sentence. An hour of proper practice with no phone is worth more than three hours of half-distracted studying.

If you are starting from zero

Do not try to cover the entire syllabus before touching real CAT questions. That approach runs out of time every single time. Take the diagnostic mock, find your weakest section, start building there, and begin solving actual questions within the first two weeks. Move into timed practice, then sectional tests, then full mocks. Each stage should start earlier than feels comfortable.

If you have been preparing for a while

Do not restart from scratch. The most efficient use of your 100 days is a feedback loop: mock, then analyse, then identify the specific weakness, then fix it, then test again. Low DILR score traced to poor set selection means you practise 15 to 20 sets specifically and then test again. That is far more useful than re-watching a lecture on a topic you have already studied twice.

On the 99 percentile question

It is possible. Students have done it starting later than you. But no honest plan can promise you a specific percentile, because your starting level matters enormously and so does whether your accuracy improves week on week. A better way to track progress is to look at how your accuracy is moving, how many recurring mistakes you are eliminating, and whether your sectional scores are trending upward. The percentile tends to follow those numbers.

Things that waste the 100 days

Collecting too many resources is probably the most common one. One good course, one question bank, one mock series is enough. Ten resources you never finish are worse than one you know inside out. Watching lectures instead of solving is the second. And taking mocks without spending real time on analysis afterward is the third; a mock with no review is three hours of effort with almost nothing to show for it.

VARC trips people up because they treat it as an English test. It is not. It is about argument structure, inference, and figuring out which options the passage actually supports. DILR trips people up because it cannot be crammed. Set selection and logical thinking are skills you build through repetition, not shortcuts.

Common questions

People often ask whether 100 days is enough if they are starting from zero. It is, if the preparation is structured and you get into real question practice early. People ask how many hours per day; three to four focused hours is a reasonable starting point. People ask whether it is too late; it is later than ideal, but the answer is to stop measuring the timeline and start measuring your actual performance week by week.

The only real failure mode here is spending 100 days consuming content and never testing yourself. Take a mock this week. Find out where you actually stand. Then work the plan from there.