I’ve taken geometry and self-studied Algebra II, so I think I can help you there. In these math classes, just make sure to pay attention and ask questions if necessary. Practice difficult topics on IXL or Khan Academy, and don’t be afraid to ask your teachers for extra help. It is difficult to take 2 math classes at once and do well, but it isn’t impossible (especially if you work hard). Algebra II and Geometry DO NOT overlap. Taking AP Computer Science on top of these two math classes is certainly even more difficult.
Honors Geometry – Studying is key for this class. You have to memorize theorems and postulates along with properties of different shapes (and some formulas). The pythagorean theorem (a^2 + b^2 = c^2) is going to be used a lot in the course, along with Special Right Triangle.
Make sure you know your basic Algebra I (completing the square, factoring polynomials, FOILing, finding slope, etc.). You will not need to work with parabolas.
Proof-writing is going to seem difficult at first, but practice makes perfect. 
Make sure to memorize all postulates and theorems, and this shouldn’t be too difficult.
I found the Law of Sines and Cosines the hardest, mostly because it is very easy to make “stupid mistakes.” A lot of students also struggled with similar right triangles.
My favorite unit was right triangle trigonometry
Geometry is a fun class, and I think you will enjoy it.
Honors Algebra II-- This class is basically just an addition to Algebra I. You will work with complex numbers, parabolas, logarithms, (maybe) vectors, factoring four-term polynomials, etc. Some memorization is necessary for success in this course.
Like I said for geometry, make sure you remember all of your basic Algebra I and this class won’t be so difficult. Khan Academy is REALLY useful for this class, and I learned a lot just by watching their videos and completing their sample problems.
Some students might struggle with complex numbers, but once you get the hang of it, it isn’t that difficult.
My favorite part of Algebra II is logarithms.
Algebra II is also pretty fun.
Now, for the non-math classes:
Honors English and D.E. U.S. History may overlap. At might school, English 10 includes literature involving American history. My best advice for you is to practice your writing skills as both of these classes emphasize strong writing. Reading and learning new vocabulary may make this easier. You may be able to study for these classes together, depending on your school.
I know APUSH uses the textbook A LOT and that may be the same with the D.E. US History you are taking. Regardless, read from the book and take notes on important concepts.
Engineering Elective – I’m not sure what to expect from this class.
Honors Biology – Make sure to memorize the vocabulary. Read from the textbook and take notes on important concepts. Don’t be afraid to ask questions or request extra help. My school does one lab a week, and they must write a lab report for every lab.
Spanish II – I would make sure to review your Spanish I vocab / handouts over the summer. Have conversations with friends in Spanish, read short texts, etc. to make sure you don’t forget everything over the summer. In Spanish II, you go over conjugating verbs in past-tense and with -ing endings. There are rules for conjugating verbs this way, just like in Spanish I (ex: verbs conjugated with Yo in present tense generally end with “o”). Quizlet or Flashcards may help you memorize vocabulary.
Good luck with your sophomore year! If you do your homework, read through the textbook, study, and participate in class, then you will be fine!!!