Magoosh has created various study plans and they are excellently planned. You can check all of their study plans ranging from 3 months to 6 months, beginner to advance and quant focus to verbal focused here: https://magoosh.com/gmat/gmat-study-schedule/
However, if you want to follow 3 months advance study plan, check out my trello board, in which I have create this study plan. Those who are working in IT sector will immediately know how benefitted they will be if they follow trello board for their studies.
Best of luck!
Magoosh's 3 month Advance Study Plan
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