If you're asking about the 'Briar U' books, there seems to be a bit of confusion because that isn't the actual series name. Elle Kennedy's series is called 'Off-Campus', and the follow-up is 'Briar U'. The whole thing is basically one big hockey romance universe, and reading them out of order will have you missing inside jokes and cameos like crazy.
The chronological order you want is: 'The Deal', 'The Mistake', 'The Score', 'The Goal', and then 'The Chase' and 'The Risk' from the Briar U set. Honestly, you could maybe skip 'The Goal' if you're pressed for time—it's fine, but it feels a bit like an extended epilogue for the first three couples. Starting with 'The Deal' is non-negotiable though; it sets up the whole friend group dynamic and the college setting.
I tried reading 'The Chase' first once because the blurb hooked me, but I kept wondering who all these people in the background were and why their banter seemed so loaded. Went back, did it right, and it was a way better experience. The later books assume you know the crew.