Work hard and take whatever opportunities that you can get. Don't focus on a tennis scholarship as there are very little out there. Just enjoy the sport and make lots of friends. At the end of the day, it's all about academics that will take you further in life but you will have a wonderful sport that you can enjoy for the rest of your life with the friends you meet along your journey.
If you can't make it onto a D1, D2 or D3 team, there is always a Club Team and you will have much more fun as it is much less demanding in terms of conditioning, practice and travel. This way you can focus more on academics while in college.