I have join NDA for that which college or classes are the best for preparation in Maharashtra
Before joining an Institute, I would suggest you to do research about the coaching result, faculty Etc. There are many coachings for NDA preparation some of the name you can prefer Apex Careers, Pune, Tara insitiue, Mumbai.
Here are some preparation tips you can follow:
Prepare mathematics with the help of the basics of class 9,10,11,12. If you are done with the basics start practicing from a good book. Be consistent with your preparation.
General Ability Test consist of two sections-English and General Awareness. The English section can be tackled by practicing questions such as error finding, fill in the blanks, Jumbled para, reading Comprehension etc.
For general awareness you need to study the social studies of class 9th and 10th and current affairs. You need to read newspapers for the current affairs.
The weightage of the general awareness section is very high so you need to be more focused on current affairs.