Never start depending subjects without completing its basic subjects
If you can spend 2hrs to 4hrs in a day just go with one subject in day. If you want to spend more than that then go with one diffcult subject and one easy subject daily.
Even though some topics of steel structures require some basics of structural analysis. It is assumed that small basics are known to student and structural analysis is placed lateral stage to avoid difficulty during preparation.
I am giving a schedule for reference. but you can also prepare your own