This might answer the question. I think refusal to continue the coding and font-sensitivity are quite strong flags that there is a problem.
http://en.wikipedia.org/wiki/Wechsler_Preschool_and_Primary_Scale_of_IntelligenceThe WPPSI�III is composed of 14 subtests.
Block Design - while viewing a constructed model or a picture in a stimulus book, the child uses one- or two-colour blocks to re-create the design within a specified time limit.
Information - for Picture Items, the child responds to a question by choosing a picture from four response options. For Verbal Items, the child answers questions that address a broad range of general knowledge topics.
Matrix Reasoning - the child looks at an incomplete matrix and selects the missing portion from 4 or 5 response options.
Vocabulary - for Picture Items, the child names pictures that are displayed in a stimulus book. For Verbal Items, the child gives definitions for words that the examiner reads aloud.
Picture Concepts - the child is presented with two or three rows of pictures and chooses one picture from each row to form a group with a common characteristic.
Symbol Search - the child scans a search group and indicates whether a target symbol matches any of the symbols in the search group.
Word Reasoning- the child is asked to identify the common concept being described in a series of increasingly specific clues.
Coding - the child copies symbols that are paired with simple geometric shapes. Using a key, the child draws each symbol in its corresponding shape.
Comprehension - the child answers questions based on his or her understanding of general principles and social situations.
Picture Completion - the child views a picture and then points to or names the important missing part.
Similarities - the child is read an incomplete sentence containing two concepts that share a common characteristic. The child is asked to complete the sentence by providing a response that reflects the shared characteristic.
Receptive Vocabulary - the child looks at a group of four pictures and points to the one the examiner names aloud.
Object Assembly - the child is presented with the pieces of a puzzle in a standard arrangement and fits the pieces together to form a meaningful whole within 90 seconds.
Picture Naming - the child names pictures that are displayed in a stimulus book.
