GCSE Required for Cambridge university.

I am going to be taking 2 of my GCSEs this year and the rest next year. I have been planning to go Cambridge university since young and was wondering what kind of grades do I need to get.
All As at least or all A* or a mixture?

There is no single answer for this, it depends on your individual circumstances. The average successful candidate has 7A*, but if you don't think you'll reach that, please don't be put off completely! Especially if you don't go to a great school, Cambridge will take that into account and cut you some slack with your results.
GCSEs are only one small part of the admissions process and an application which is strong in other areas can make up for lower gcse grades.

if Cambridge has been your dream since you were young and you think you have a good chance of reaching the standard offer for your course at A level, I encourage you to just go for it and apply. You don't want to be wondering 'what if?' for the rest of your life!

best of luck