Hi Dandylyon -
Welcome to the site! There will be a way in the near future for you to select the types of puzzles you want to solve, but at the current time no, it is not an option. All puzzles are delivered at random. You can, however, help yourself along if you get stuck by clicking the ? (help) tab on your solving screen and requesting a hint. The system will tell you whether or not you've got any errors on your current board, and will also send you one true pair relationship to help you along your way.
Like most other things, the more you solve, the more you'll improve over time.
Thanks for playing!