Need help understanding test scores?

He qualified for IEP last year in kinder for SLD, they refused. This year he still isn't reading. He hasn't progressed at all in writing. (I have 13 year with SLD in auditory Processing and Dyscalculia girl, 12 Asperger's with language SLD boy, Pragmatic Language Impairment and visual spatial weakness 10 year old boy,) My 1st grader was diagnosed by UC Davis Mind Institute as Pragmatic Language Disorder(PLI).

Tests:
October 2009
Standard Scores

WIAT-II
Mathematics: 105
Oral Language: 128
Word Reading: 104
Numerical Operations: 94
Math Reasoning: 115
Spelling: 91
Listening Comprehension: 122
Oral Expression: 123

CAS
Planning: 100
Simultaneous: 116

TAPS-3
Overall: 101
Phonological: 119
Memory: 99
Cohesion: 83

VMI: 125

MVPT-3: >145

December 2009:
WPPSI-III
Verbal: 108
Performance: 140
Processing Speed: 94
General Language: 116

May 2010:
TOPL: 5th %ile

January 2011:
DAS-II:
Verbal Ability: 144
Nonverbal Ability Reasoning: 122
Spatial Ability: 129
Working Memory: 109
Processing Speed: 84

WRAML 2:
Verbal Memory: 117
Visual Memory: 103
Attention/Concentration: 109
General Memory: 113

CTOPP
Phonological Awareness: 113
Phonological Memory: 124
Rapid Naming: 97

WISC-IV:
Processing Speed: 94

NEPSY-II(Percentiles):
Auditory Attention Total: 50th %ile
Auditory Attention Combined: 37th %ile
Design Fluency: 84th %ile
Inhibition Total: 91st %ile
Inhibition Combined: 95th %ile
Statue: 91st %ile
(Social Perception)
Affect Recognition: 75th %ile
Theory of Mind: 63rd %ile

VMI: 107

WIAT-III:
READING COMPREHESION: 77 (6th %ile)
WRITTEN EXPRESSION: 80
SENTENCE COMPOSITION: 83
ORAL READING FLUENCY: 84
TOTAL READING: 85
WORD READING: 88
MATH FLUENCY – ADDITION: 92
BASIC READING: 92
MATH FLUENCY : 93
MATH FLUENCY – SUBTRACTION: 94
TOTAL ACHIEVEMENT: 96 (39th %ile)
PSEUDO WORD DECODING: 97
SPELLING: 103
NUMERICAL OPERATIONS: 108
LISTENING COMPREHENSION: 111
MATHEMATICS: 111
MATH PROBLEM SOLVING: 112
ORAL LANGUAGE: 123
ORAL EXPRESSION: 128

Arizona Articulation Test: Normal Limits, emerging and stimulible.

TOPS 3
Making Inferences: 98 (44th %ile)
Sequencing: 103 (57th %ile)
Negative Questions: 92 (29th %ile)
Problem Solving: 112 (79th %ile)
Predicting: 113 (80th %ile)
Determining Causes: 104 (60th %ile)
Test Composite: 104 (60th %ile)

Vineland-II: (Only Teacher Submitted, we forgot to turn ours in)
Communication: 86 (18th %ile and they call that adequate)
Daily Living Skills: 84 (14th %ile)
Socialization: 92 (30th %ile)
Motor Skills: 81 (10th %ile)
Adaptive Behavior Composite: 84 (14th %ile)

Thank you! I added a bit of clarification here:

He was assessed last year(age 5) for an initial evaluation by the school district, due to issues in the classroom. We were told that he didn't qualify for a SLD or for an IEP. Although, the copy of his psycheducational report I got, stated that he qualified for IEP with a SLD.

He had assessments done with the UC Davis MIND Institute (Medical Investigations of Neurodevelopmental Disorders.) In February, the doctor said not ASD but no speech evaluation was done yet. He was diagnosed with Pragmatic Language Impairment by the MIND Senior SLP. He has been re-referred to assess for ASD, as my oldest son was diagnosed with ASD this year too. All three of my boys have severe prag lang delays.

We requested new school assess my youngest(age 6 almost 7) because he is having a really difficult time reading, writing, and processing what he learns. He will sound out a word, and read it. But next day is like its a new word again, and he's reading it for the first time. His writing hasn't progressed since the beginning of the year. Neurologist said his IQ is most likely over 145 or even 150.

All my other 4 kids started reading prior to starting kindergarten, he is 5 months into first grade and even with being given the tools he isn't picking up on it... and he isn't up to grade level with math.

He has had the same personality since he was a baby. He was born at 30 weeks. There has been no traumatic brain injury, etc. He received services, as an infant and toddler, for a significant developmental delay (at 9 months, w/ adjustment age of 6 1/2 months he was determined to be at the level of a 2 month old.) He received developmental therapy, occupational therapy (twice a week), physical therapy (twice a week), and speech therapy (twice a week from 9 months to 24 months, and once a week from 24 to 34 months) from the age of 9 months until 34 months.

He is a very serious, literal child. He stacks everything. He prefers things that aren't real toys(like cups, paper clips, etc.), unless it is blocks and legos. His favorite topics are Mario from Super Mario Bros., and Roblox (online game that is like legos). He is able to converse about other topics, but doesn't usually ask about the other person's ideas, likes, dislikes, thoughts, feelings, etc. Although if you do tell him, he will then know. But never occurs to him LOL He loves watching the science and history channels, and will repeat the information back to you.

They are qualifying him for a SLD in processing speed. But I don't think that is what is keeping him from achieving. He scored low in VIQ(108) vs. PIQ(140) last year... so the IQ score given to us isn't even considered valid. His WMI was low in comparison as well.

BTW, the SpecEd teacher stated that the WIAT-II scores from last year are because the Kindergarten children have "easy" tests and that as long as a "warm body" is there, they'll get a good score. Basically, saying the scores last year are invalid??? Is this true?