There's no publicly available information about the difficulty of the "old Scona entrance test." The Strathcona High School entrance exam has changed significantly over the years, and details about past tests are not readily accessible. Any information found online about previous tests would likely be unreliable or outdated.
To understand the current difficulty, you'd need to look at the current entrance requirements and the type of questions asked in the current exam. Contacting Strathcona High School directly is the best way to get accurate information about their entrance process and the level of difficulty of the current test.