Hi,
There will be 5 sections in AILET 2019. There will be 35 questions from each of these sections: Legal Aptitude, English, General Knowledge, Logical Reasoning  and 10 questions will be asked in Basic Mathematics section. I think nobody other than the toppers of AILET can tell you about good and useful books for AILET EXAM. Go through the interviews of the Toppers of AILET (https://law.careers360.com/tags/ailet-topper-interview). It will give you fair idea of good strategy and useful books. I hope it helps!