I studied and passed the SQE exam using only the Certified SQE handbook, the tests in the handbook, sample questions on the website, and Certified SQE Question Bank. I did the questions repeatedly and wrote notes throughout my Handbook. Cost: $198
During the test, there were a few questions that weren't in the Handbook and Question Bank so I would skip them. I focused on the questions I knew the answers and then went back to focus on the questions I didn't know. The hardest part for me was finishing the test within time.
Good luck on your studies!