Yes, 7.5 IELTS score is considered a good score. It demonstrates that the user can use complex language and has a good command of language. 

The availability of the number of IELTS exam slots depends on the test location, date, and time of the exam. For IELTS CBT, the availability of IELTS slots is more frequent than paper-based tests. For PBT, some locations offer up to three slots per day.