there is no shortcut ..
n Score will improve..
Was not referring to "shortcuts" to achieving a good score, but different approaches towards a QUANT. question. For a MCQ, using the answer key and backsolving to find the correct answer is a legitimate and often the fastest way to approach many tough or time consuming problems, As the video by Ron suggests, it is always wise to be well versed with different approaches to solving a problem rather then just the Traditional approach.
"When you want to succeed as bad as you want to breathe, then you’ll be successful.” - Eric Thomas