Sketching for Portfolio

unless the programs you mentioned are super competitive/hard to get in to (in which case maybe asking people a those schools might give you more insight for the level you need to be at), i wouldn’t worry about it too much, rather just continue to practice sketching, using the fundamentals of perspective and simple forms as base for more complex forms and just cultivating a relationship with communicating visually, because you will learn a lot in whichever program you choose/get accepted to…