Technical skills are useful for the work that you'll do, but you will learn everything you need throughout your internship program. ASK QUESTIONS! I cannot stress this enough: ask questions during your internship, regardless of where you end up working at. What is extremely important is a positive attitude and eagerness to learn. The more motivated you are when you come into work, the more likely you are to succeed throughout the summer. More importantly, don't be afraid to fail. The most successful people are those who are willing to fail and learn from their mistakes, and therefore excel at various projects.