Hi, JEE Main and Advanced test series are available on the internet. some are free and some are paid. There are also so many books in the market. The previous year papers can be found here - https://engineering.careers360.com/articles/jee-main-sample-papers and https://engineering.careers360.com/articles/jee-advanced-sample-papers. Preparationfor JEE Main can be with the help of these too. As for the AITS fee, check http://aitsrajampet.ac.in/feedetails.html