High School stats research project will have incremental updates. Each day, we'll do some research and upload the latest available stats and player bridges. At the time of this entry, there are 1069 school/seasons available. Keep checking in to see this number grow and eventually, the number will impress you enough to sign up to a TBC PREMIUM account.
Player bridging is a manual process (with an automated review system behind it). You may find players in the data who are not yet bridged when they clearly have a player page on the site. All players will eventually get bridged.