Shall I retake the GMAT? Is Magoosh worth all the hype?

Dear Family, I took my GMAT this April (old format) and got a 640(V31 Q47) AWA-5.5 IR-5. I have already taken coaching from a reputed GMAT institute in India and I am well aware of all the concepts. I have issues while applying the concepts! I took three GMAT prep tests Prep 1 :720(V41 Q48) - Felt m...