I did not fair so well on standardized tests, and therefore, I became a Malcolm X, reading everything I could get my hands on. I even carried a pocket dictionary with me, so I could improve my Etymology, particularly looking up those words I didn’t have a clue as to what they meant.
Parents, read early to your children, so they will develop a knack and love for reading. Then, make them read to you, asking pertinent questions such as who, when, what, where, why, how, and how many. This will ensure you know whether or not they are comprehending what they have read. This will also allow you to focus on those weak areas, and develop them more.
As for math and science areas, put the children in some type of music program, where they read notes to play the instrument. There has been a documentary that children that learn to read musical notes while playing an instrument do exceedingly better on standardized tests in the areas of math and science, than children who have no musical background at all.