Hey I choosing my a level subjects, is choosing two new subjects not a good idea
It depends. It can be fine.
When making the choice I suggest you do subjectas you enjoy and that interest you. Higher grades give you access to better unis. You may also ask will the current A levels get me on the course I wish to do?
What did you or think you will get at GCSE? What do you think you can get in the new ones? What are the course requirements for your degree?
It could be fine or it could be risky. No information to go on.