How to Improve TOEFL Reading Score in 45 Days

I recently took the TOEFL exam and struggled with the reading section, scoring 18/30. I plan to retake the test in 45 days and need advice on how to improve my reading skills.
I identified a few challenges I faced:
I find it difficult to read quickly and understand the content.
I tend to lose focus while reading long passages.
I struggled with time management during the reading section.
Given these challenges, what specific practice strategies should I follow over the next 45 days to enhance my reading skills and boost my score?

Thank you in advance for your help!