Many schools do give ability tests in early elementary school in order to screen children to determine who needs either enrichment for giftedness or extra assistance for a possible learning problem. There is really no way to help a child score better on an ability test, although maturity and exposure to academics will help stabilize a child's score.
The scores you indicate for your child do show a large split between verbal and nonverbal skills. This may be attributed to distractibility or it may indicate that his or her verbal skills are weaker than nonverbal. If your child has trouble with reading you may want to ask the school about individual language testing.