There is no publicly available, credible evidence confirming that Dick Van Dyke scored 150 on the Army General Classification Test as stated in his autobiography.
According to Dick Van Dyke’s autobiography, he scored 150 on the Army General Classification Test.

FactVerify
Source: factverify.com
Key Evidence
Dick Van Dyke's military service and career are well documented, but none of the consulted reputable sources mention his Army General Classification Test score. No direct excerpts from his autobiography confirming a score of 150 were found in available public records or biographies.
en.wikipedia.orgen.wikipedia.orgDick Van Dyke
warhistoryonline.comwarhistoryonline.comThe Second World War Helped Launch Dick Van Dyke's Acting Career
What the Evidence Shows
The claim states that Dick Van Dyke scored 150 on the Army General Classification Test according to his autobiography. The components of this claim are: 1) Dick Van Dyke took the Army General Classification Test, and 2) he scored 150 on it. While it is well documented that Dick Van Dyke served in the military during World War II and that he has an autobiography, none of the available sources or biographical summaries explicitly mention his score on this test.
The Army General Classification Test was used during World War II to assess recruits' abilities, but specific individual scores are rarely publicized unless highlighted by the individual or in official records. The search results and authoritative biographies (including Wikipedia, Britannica, and official sites) do not provide verification of this specific score. Without direct citation from the autobiography or a reliable secondary source quoting it, this claim cannot be confirmed.
It is possible that the score is mentioned in his autobiography, but without access to the text or a reliable excerpt, the claim remains unverifiable. There is no contradictory evidence either; rather, there is simply a lack of accessible evidence to confirm or refute the claim.