To be absolutely clear on the concept, i think there is nothing wrong in knowing all 12 of them because inadvertently we will come across all of them during the prac Qns, if not during the exam..so to build confidence and gain knowledge, there is nothing wrong in knowing all 12 of them....
Fire the final bullet only when you are constantly hitting the Bull's eye, till then KEEP PRACTICING.
A WAY TO INCREASE FROM QUANT 35-40 TO 47 : a-way-to-increase-from-q35-40-to-q-138750.html
Q 47/48 To Q 50 + the-final-climb-quest-for-q-50-from-q47-129441.html#p1064367
Three good RC strategies three-different-strategies-for-attacking-rc-127287.html