HighIQ - You've received a GREAT reply above. I'll just add a bit more detail.

Here is a link to a roundup thread on Acceleration. In reading various discussions which have occurred over time, you may see:
- multiple grade skips (radical acceleration)
- parents may choose to NOT to accelerate a child for many reasons, including avoidance of a relative size disadvantage in sports and social situations which may occur due to being younger than classmates
- Iowa Acceleration Scale (IAS) suggests minimum IQ score a for grade skip (but does not mention a minimum IQ score for radical acceleration).

As with all manner of performance and achievement, a person's IQ score is only one factor. The IQ score may not be the strongest predictive factor or determinant of success.

To skip 2nd, 3rd, and 4th grades, and have a successful 5th grade placement, a student would have learned the material taught in 2nd, 3rd, and 4th grades and demonstrate readiness and ability for learning at the 5th grade level. Students in 5th grade may typically be 10-11 years old, and may have significantly different interests and social behavior patterns than a student typically placed into the 2nd grade (often 7-8 years old).

It is reasonable to theorize that looking back through time to first grade (typically 6-7 years old), a first grade pupil may not have been aware of all the assessments and discussions which occurred regarding potential acceleration decisions for their upcoming school year, and may only be aware of having taken an IQ test.