Faisukhan,
Good questions. I'll answer from the instructor side rather than as a test-taker, since I've watched a lot of people prepare while working full time.
On the timeline, most students holding down a full-time job need somewhere in the range of three to six months. Where you land inside that range depends on two things: how far your current ability is from your target score, and whether you're refreshing quant and verbal fundamentals or rebuilding them. Someone with a strong quantitative background aiming for a 605 might get there in three months. Someone rebuilding math from the ground up and targeting 685 or higher should plan for closer to six and be pleasantly surprised if it comes sooner. If you want to sharpen that estimate before committing to anything, GMAC offers official practice exams on mba.com, and taking one at the start gives you a rough sense of the distance you need to cover. Just don't read too much into the score itself at that stage, since all it can really tell you is that you have gaps you haven't addressed yet.
For weekly hours, ten to fifteen is realistic for most working professionals, and twenty is doable if your schedule cooperates. What matters more than the raw number is how you distribute it. Five or six focused sessions across the week will do more for you than one long Saturday marathon, because the material has to be revisited often enough to become automatic. Protect at least one lighter day so you don't burn out in month two, and treat consistency as the thing you're actually optimizing for. The students who improve the most aren't usually the ones with the most hours logged. They're the ones who showed up steadily for months.
On resources, my strong recommendation is to build your prep around one comprehensive, structured course rather than assembling something from scattered free videos and question sets. A good course lets you isolate topics one at a time, learn the concepts in a deliberate sequence, practice at increasing difficulty within each topic, and track your accuracy so you can see exactly where you stand. That last piece is underrated. Without accuracy data by topic, you end up studying what feels productive instead of what's actually holding your score down. Since you asked for recommendations directly,
Target Test Prep is the course I built to do exactly that, and you're welcome to try it and see whether the approach fits how you learn. Alongside your course work, the GMAT Official Guide and the official practice exams are worth having for calibration and for exposure to authentic questions, though I'd treat them as supplements to your curriculum rather than as the curriculum itself.
Your last question is the one people get wrong most often. Most students book the date early to create accountability, and what usually happens is that the date arrives before they're ready and they sit for an exam they know they should have pushed. Readiness isn't a feeling, it's evidence. You're ready when you've worked all the way through your course, when you're consistently accurate on hard questions in topics you've studied, including questions you've never seen before, and when your timing has stabilized to the point where you're not sinking five minutes into single problems. Once you're at that stage, move into a practice test phase in the final four to six weeks, roughly one full-length exam per week under realistic conditions, and take the last one five to seven days out rather than the day before. When those scores are landing at or near your target with some consistency, book with confidence.
The one practical caveat is that test appointments do fill up, especially around application deadlines. If you're working toward a specific round, look at availability early so you know how far ahead you need to reserve a slot, and give yourself enough runway that a retake is still possible if you want one.
You're approaching this the right way by planning first. Set a realistic timeline, protect your study hours, and let the data tell you when you're ready.
Check out this article for more advice:
https://blog.targettestprep.com/best-gm ... e-methods/ Faisukhan
I'm planning to start preparing for the GMAT and I'm trying to create a realistic study plan. For someone with a full-time job, how many months of preparation would you recommend before taking the exam?
I'd also like to know:
How many hours did you study each week?
Which study resources helped you the most?
At what point did you feel ready to book your test date?
I would appreciate any advice or personal experiences.