I need a Visual Basic developer -- 2

I’m developing a simple math game. I’m looking for help/ guidance in getting it to randomly alternate between asking multiplication, devision, subtraction and addition questions. If we have time I’d like to be able to include a binary, linear or some sort of search which displays the results of users from highest score to lowest score. Though the math part if priority. I Need help before the Wednesday 17th of august Australian time. Thank you for your consideration.