chipboard

Got an old council house, under the carpet is a layer of thick chipboard. Looking to put lvt down but need to plywood over the chipboard first. What method would anyone use for fixing the plywood ontop of the chipboard?

Problem: Tiling a kitchen floor. Half is covered in bitumen (from parquet floor). Half is a new concrete slab. There is a 35mm level difference across the floor and is fairly lumpy. Possible solution No.1?: Use latex self-levelling compound such as arditex na. BUT: I am slightly worried...