How to find these. It's not hard, these were the first 3 I found. Go to https://www.google.com/search?q=%22early+intervention%22+math+%22randomized+controlled+trial%22&client=firefox-b-1&ei=ClnJW_7AKtC9ggfAx6KwAw&start=0&sa=N … Then skim abstracts for studies with long-term follow-ups, at least at grade 3, and sample sizes > 500, preferably larger. Then look at results tables, don't take author words.
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The hidden world of famous things that don't replicate very well.
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