I must say that 45 in mgmat tests and that too in test no 1 shows that ur level is already 48-49. IMHO.
Have you taken a gmatprep till now?
Advanced quant is an awesome book and you're correctly timed to do this book.
check out this strategy as well wherein some valuable insight is provided by instructors on how to reduce the careless errors.the-final-climb-quest-for-q-50-from-q47-129441.html
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