Welcome, Ben.
To your direct question, it isn't books or practice sets. It's both, in a specific order, one topic at a time. Practice questions don't teach you the concepts, formulas, and techniques the test is built on, and reading through material without working questions doesn't build the ability to apply any of it under pressure. So the sequence that tends to work is this: learn a topic thoroughly, then practice only that topic until your accuracy is consistently high, then move to the next topic. That's the engine of the whole plan, and it doesn't change just because the timeline is short.
Before you build the schedule, take a free official practice test from mba.com. That baseline score shows you how far you are from your target and lets you set realistic expectations for what one month can do. Treat it as a checkpoint that tells you the size of the gap. The detailed plan gets built through the topic-by-topic work that follows it.
I also want to give you my perspective on the timeline. One month is aggressive. Most students take considerably longer than a month to get ready, and a month usually works only when the starting point is already close to the goal. Some people do pull it off, particularly when they can study close to full time and the gap is small. Many can't, and sitting for the exam underprepared often costs more time than moving the date would have. It's also worth pinning down what a competitive score means for your specific school list before you plan around it, since a target you're already near and a target well above your baseline call for very different four weeks.
On resources, whatever materials you settle on, the organization around them is what determines the outcome. Prep assembled from scattered sources leaves you acting as both the student and the course designer, deciding what to study, in what order, when a topic is genuinely mastered, and which weaknesses are causing repeated errors. So build those things in deliberately: a sequence that runs from fundamentals through advanced material, a clear standard for when a topic is finished, and a record of your accuracy by topic so you can see where you actually stand. The Official Guide works well as practice once you've learned the underlying content for a topic.
Within the month, prioritize aggressively. Move faster through topics you already handle well and spend your time on the ones costing you the most points. For every question you miss, ask what actually went wrong: was it a concept you didn't know, a misapplied formula, a misread, a careless error, or a trap answer? Then redo the question from scratch, without the explanation in front of you, to confirm you can execute it on your own. That review is part of what makes the practice pay off, alongside solid content mastery, enough reps to make the approach routine, and timed work once the accuracy is there.
Save the timing work for after your accuracy is solid. Once a topic is under control untimed, do short timed sets on it to confirm the speed is there. Full-length practice tests belong late in the month as readiness checks. They mostly measure where you are, so burning through them early costs you your best calibration tool at the moment you most need it.
Plan for a significant, near-daily time commitment, spread across most days of the week rather than concentrated in a few long sessions. Then let that last official practice test decide the date. If it lands at or near your target, sit for the exam. If it shows a gap you can't close in the days remaining, move the date and keep working topic by topic until the accuracy is there.
Hope this helps, and good luck with your prep.
SoftRat
Hello everyone, it’s Ben and I am new here.
I would really appreciate your tips on how to structure my study for the GMAT in ONLY ONE MONTH. I know this might not be ideal and many of you have preparing for so long, but would appreciate your tips to accelerate my journey so I can achieve a competitive score in one month of prep. Do I have to study the book, or just practice sets?
Thanks in advance!
https://gmatclub.com/forum/report.php?f=1&p=3612339