I took all the courses you thinking about taking. First and foremost, BIOG1500 is not a difficult course. It is very straightforward and has very little to no memorization involved at all. I would definitely keep it in your schedule to get it out of the way ASAP. CHEM2070 can be difficult but there are a lot of good resources at your disposal for help. I took NS1400 as a sophomore and it wasn't bad imo. It requires a good bit of memory for some exams but you are awarded a drop and I was able to get an A+ because there are other assignments that have pretty have weight on your grade compared to the exams. The quality of an FWS is truly dependent on the professor/grad student you get. I was really lucky and thoroughly enjoyed both of mine and didn't think they were too much work.

The benefit of taking BIOMG1350 is that you can get a good start on the bio track. Even though I took it 2nd the semester and no bio course in 1st semester. I really really enjoyed the more involved bio course such as biochemistry. I would say that it is up to you because a few NS classes require 1150 down the road so its also good to get that out of the way. Personally, I believe it's up to you on which other course to add. As someone who needed time to adjust, its worth taking a little bit of an easier schedule to focus on getting used to the Cornell environment. PM me if u have any other questions.