All universities have different criteria when it comes to GPA. Prior to applying, I would recommend doing some research as to what criteria is required for admission as well as confirming they offer courses that peak your interest for your chosen major.
I would recommend focusing on your current course load and achieving the best possible grades you can and less on what is required by the universities. This is because there are an abundance of wonderful universities that you will be able to apply for that meet your needs and provide wonderful higher education. A good avenue to explore would be to see if your current school offers Advance Placement (AP) classes, you could begin working towards college classes before graduating high school!
Lastly, from my experience, employers focus more on the commitment of completing a 4 year degree (or higher), opposed to the actual school or GPA attained.
Good luck as you move forward with your education!
Another avenue you might pursue: Where I live there are programs through a local community college for HS Juniors and Seniors to start earning college credit. This may be available where you are and if so would allow you to get a head start on credits, especially the basics in English, Maths, History, etc. In these programs, students are completing coursework that counts towards both HS graduation and college credits.
Lastly, Gloria is again spot on when she says that she's never been asked about her university choice when applying for a job. That's been my experience too. The degree gets you in the door and where you go from there is up to you.
Brandon recommends the following next steps:
It will vary by university, so you will need to check on that when you look to apply to a school. Please know that GPA is one of many categories that universities look at when considering students for their school. You should attempt to do your best in high school. I would recommend taking classes that push you but not classes that are so hard that you are going to struggle to get good grades. I thought that smart people just took every level of Math. I did not need four years to graduate from high school, so I should have just done the minimum. I was not going to use math in any career that I chose, so it was not something that I should have pursued. I would say focus on subjects that you will need to continue toward your desired career. You also need to consider other elements of the college application, such as outside of school activities and volunteering. You don't need to match every element exactly. You have to have a good level of all the expectations that they have of you.
I will add one last thing. There are very few jobs where the name of the university is going to get you a job. Some schools helps but most don't. I have never had an employer care about what school I went to, just that I had gone to university and got my diploma. So do not think that you have to go to a well-known school or have to pay a lot for a school either.