It's alright but wouldn't recommend for long term use. The more popular and better textbooks are Conquering and jacaranda. You can use these in conjuction with Ahmad shah's notes and you should be set! Focus more on jacaranda. Even though it goes into so much depth with irrelevant info, it is helpful in answering some of the harder curveball questions.
Use conquering secondary to this.
NEVER use pathways or surfing! These are the equivalent of Maths in focus tbh and they are terrible.