@mninek Whatever you do, please don’t rush through math. If you really want to be an engineer, your math skills need to be rock solid.
What are you doing for math right now? You could start alg 2 right now. Take a look at Derek Owens’ website. His classes are asynchronous (meaning you can start whenever you want and work at your own pace.). He offers math through calculus. http://www.derekowens.com/course_info_algebra2.php
Thinkwell is another option: http://www.thinkwellhomeschool.com
You can start physics now as well. DO also has physics in addition to math.