1. On GMATClub tests I was scoring Q47-49. Is that enough for GRE?
Average score on the gmat: could be not enough for the verbal section of the GRE: notoriously more difficult the that of GMAT.
2. Where can I find hardest GRE quant challenges to train?
https://gre.myprepclub.com/forum/the-5-lb- ... -8820.htmlhttps://gre.myprepclub.com/forum/greprepcl ... -3523.htmlhttps://gre.myprepclub.com/forum/powerprep ... -3118.html3. I don't have a very comprehensive vocabulary (I am non-native), but I am applying to MSc in Data Science. How important is my verbal score? I am not that good at remembering words that nobody uses in the real life, and I don't see any difference between saying that "I am motivated to pass GRE" instead of "I am galvanized to pass GRE", especially for a person who should be good in quant, not in verbal
Could be not so much important but it depends on the University you apply for.