My HS team was undefeated through the state championship all four years I was there. In two of the four years no one on the team lost a match for the entire season - including the state championship. We were AA, so AAA was above us (bigger schools), but I think we would have won AAA each year as well, but it would have been considerably more competitive. Of our top two players, one was a NCAA Division I singles finalist two years in a row (got to ~ATP 160) and the other guy got to ~ATP 120. Then we had at least another six players (not all in one year) who were starters on above-average to middling D1 teams. I made the team as a freshman but only played a few doubles matches that year. As a sophomore and junior I played #2 and #1 doubles (the top-6 played singles, the next six played doubles). As a senior I rotated between #3 and #4 singles. After my last high school match I didn't touch a racquet for almost 28 years.
We had no daily routine. Our coach was responsible for getting us to away matches (so, show up at the van on time) and making sure we showed up for home matches and that's about it. Sometimes he would schedule a challenge match between two players close on the roster but that's about it. Otherwise, we just did whatever we wanted to - sometimes we'd play at the HS, but most of the time we'd play at the small club a mile away where everyone was a member, or a mix of the two. We rarely saw our coach unless it was a match day.
It was an interesting social dynamic because my HS was new - the school opened my freshman year. So, as is typically the case with new schools, the other sports teams struggled - football, baseball, basketball... mediocre at best (and generally bad). So, in our gym, each year six new banners were added - district, regional, and state championships for boys and girls tennis. And that's it - nothing else, not even a district championship for any other sport. So, in most high schools tennis is a secondary sport and the jocks (and, frankly, the rest of the school) don't even give it a second thought. But at my HS we had the begrudging respect of the jocks because not only did we completely dominate in a manner they couldn't comprehend... we didn't even have to show up for practice. So, they're out there busting their 4sses every day to try to win a game, and we just show up for matches and win easily - they were dumbfounded, perplexed... jealous. My teammates were really fun - and when I was a freshman/sophomore, the juniors/seniors on the team, by coincidence, ran with the popular crowd, so the rest of us underclass dorks benefitted from a social halo effect. Anyhow, being on the tennis team was fun; high school in general, less so.