This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
There are no shortcuts for math. Other ways are typically known as shortcut but I think its just another method of solving... But it takes technique to do it fast. Learn to listen well, practice regularly, and join on contests even you are not really good. But its only a mindset. Everyone's capable of joining contests. Try and try until you succeed your goal...