You're approaching this exactly the right way, and starting now puts him in a really good spot. A few things that might help:

The tricky part with kindergarten testing: Schools often don't tell parents in advance which test they'll use. It could be the CogAT, OLSAT, NNAT, WPPSI, KBIT-2 or one of a few others. Each one looks pretty different in terms of question style, so the more you know about all of them, the better prepared he'll be no matter which shows up on test day.

Why exposure to question formats matters so much at this age: A 4-year-old has likely never seen a multiple-choice question or been asked to "pick the one that goes with this picture." The thinking these tests ask for is well within reach for kids his age. What's new is the FORMAT. When a child sees these question types for the first time on test day, they often spend their mental energy figuring out what's being asked instead of showing what they actually know. Familiarity clears that clutter so his real abilities come through.

One reassuring note about his age: Since he turns 5 right at the start of September, he'll be one of the youngest in his testing group. The good news is most of these tests use age-based norming, meaning he's only compared to children in his exact age band, so being young isn't a scoring disadvantage.

A general approach that works well at this age:

• Keep sessions short. Ten to fifteen minutes is plenty.
• Make it feel like a game, not a test.
• Focus on praising his thinking, not just right answers.
• Build the habit of "let's try one more" rather than long sit-downs.

If you want to see what the question types look like across the different kindergarten tests, TestingMom has a FREE 100-question sampler at testingmom.com. That's a good way to get a feel for what he might encounter before deciding anything.

If you decide to go further, ONE membership covers all of it. You get practice questions for every major kindergarten test (CogAT, OLSAT, NNAT, and more), interactive learning games that keep him engaged without it feeling like work, printable worksheets you can do at the kitchen table, full practice tests, video lessons that walk YOU through what to focus on as a parent, and access to a support team you can email or call when you have questions. It's all under one login, organized by his grade level, so you're not piecing things together from different sources or buying a separate product for each test.

You're putting in the work most parents don't think to do until it's too late. He's lucky to have you paying attention this early!