A major attraction of the Litvak path is family values. Does it actually work? I would have to say it does to some degree. A lot depends on how dedicated to learning Torah one is, and how much one's wife is. If you start out with the basic idea to learn Torah and to trust in God to make ends meet, then certainly the Litvak path works well. But if you start with wavering, then it is like a top spinning around. You know when it will fall because that is when it starts to waver.
I do include math and Physics in the category of learning Torah however.
But most secular subjects outside of these two I consider Bitul Torah. Some secular subject however I think are OK to learn because of Parnasa/[making a living] like medicine.
The terms "bitul Torah" refer to the fact that one is obligated to learn Torah whenever he has time. It matters not if one is smart or not or even understands what one is learning. ''Bitul'' means literally ''nullification.'' This is a lot more serious than the idea that one is obligated to learn Torah. It makes not learning [when one can] into a sin.
How I encountered this idea was in a small book "Binyn Olam" that I saw in my first year in Shar Yashuv. And I still hold by this idea strongly except that I expand the definition of learning Torah to include Math, Physics and Metaphysics of Aristotle.
Not that I am able to learn much myself. Rather my intention here is simply to set the record straight about what the Torah is all about.
The disciple of the Gra, Rav Haim of Voloshin wrote a small book about this important subject also.
So what I suggest is to go through the two Talmuds with Tosphot and Maharsha and the commentaries on the Yerushalmi [Pnei Moshe, Karban HaEda.] Plus Math and Physics. But since neither math nor physics has an official set then you simply have to get through the basic subjects with whatever books most make sense to you. That would be String Theory, and Algebra. [Algebra nowadays is divided into different parts. There is Abstract Algebra, Geometric Algebra and Topological Algebra.
[So I am not thinking of math and physics as just for parnasa [making a living] but rather a regular part of learning Torah. This is not something you see in most Musar books. Rather I mainly got this idea from the very first and most important Musar book the Obligations of the Heart. Part III Behina. where he goes into the different aspects one should study about God's wisdom. There he talks about many aspects of creation. And then goes into the spiritual aspects of creation--so we see they are different. In any case this is more clear in other rishonim.