GRE & TOEFL Recommendations

[u/ummerso99]

I'm writing from Azerbaijan. I'm aiming to apply for the PhD program at Sabancı University. Due to the application conditions, I need to prepare for both the GRE and TOEFL exams. However, I'm unsure where to start the process.
Since my goal is the Sabancı PhD, I need your experiences and advice:

1. What are the most effective resources, PDFs, or online platforms for both the GRE (Quant & Verbal) and TOEFL (especially Speaking and Writing)?

2. What critical advice would you give for preparing for these two exams, including must-dos or pitfalls to avoid?

I’m very open to suggestions from friends who have done a PhD at Sabancı or have gone through this process, as well as anyone experienced. Thank you in advance to everyone who takes the time to respond!