Quitting your job isn't a good idea, unless its for a job that while less demanding, still shows career progression.
Even with a high pressure job, you can still get a decent score on the GMAT if you spread out your prep time and use good resources. The good news is, you're thinking about this early!
For instance if you started studying next month in December, with a goal of taking the GMAT for the 1st time in May, and possibly, resitting in July, you have 6-8 months to study. Here are some ideas:
- Plan to spend 2 hours during the week and 3 hours on the weekend studying. For instance, you can get up 1 hour early Tuesday and Friday, and then Sunday morning, dedicate three hours just for GMAT prep. Five hours each week for 6 months gives you at least 120 hours before you take the first exam.
- Use two different sets of resources, but not at the same time. Eg. you can try
Manhattan GMAT for the first 4 months, then
Magoosh.com for the last 2 months. This isn't about the specific books or courses (I'm not endorsing them), but about making sure that you are approaching the exam from different angles.
- You can always apply Round 2 next year, which means you have at least 9 months to study, plus an additional 3 months to do deep research and apply to schools
- Make sure to apply to a range of schools, especially if you're only able to make round 2. For instance, you could do 1 M7, 1 Top 10, 1 Top 15, and 1 Top 25. That way you are guaranteed to get into at least one school in round 2, and would not have to deal with Round 3.