Overview: I went from 650 practice test to 780 official test in less than two months for free and I'll be going over exacly what strategies and resources helped me make that improvement. Feel free to PM or respond with questions if you have any. Just hoping to share my experience and help others looking to improve.
Resources: GMATclub question bank, GMATninja verbal and VeritasPrep youtube series, misc youtube vids (that's it!)
Strategy: First, I took a diagnostic exam to see where my weaknesses were - pretty standard stuff. Scored 650 (42Q 37V) and knew I needed to increase both. I'll breakdown quant and verbal strategies below because I approached them each a little differently.
Quant: I used GMATclub question bank and just started doing questions. For every question I got wrong, I would find the underlying topic it was testing, look up a youtube video and learn that skill inside-out (khanacademy is your friend). I repeated this process, working my way up in difficulty, until I rarely saw a question that was testing something I had not seen before. Repetition is key here but even more important is understanding the underlying concepts and reasons you got a question wrong. I guess you could call it calculated repetition.
Verbal: I would estimate 80% of my time spent practicing was directed towards verbal. Seeing as the GMAT composite score weighs heavily on verbal, I knew I had to be bulletproof on this section. (Side note: perfect quant + 50th percentile verbal = 640 composite, whereas perfect verbal + 50th percentile quant = 740 composite)
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