Dear aspirant,

If you want to prepare for JEE at a minimal cost without having to go to coaching, you definitely can do it. If you crack JEE Mains with a good rank you'll be eligible to get admission into NIT and will also qualify for JEE Advanced which help you get into IITs. AP EAMCET and JEE have similar syllabus but require slightly different approaches. You need to faster to be able to finish AP EAMCET questions on time. Follow NCERT, Arihant publications for math, OP Tandon for Organic chemistry, P Bahadur for Physical chemistry, HS Verma for Physics. After finishing the topics from the reference books go and solve previous year questions rigorously, take timed tests atleast twice a month and solve all previous year questions thoroughly, you can get study materials online or from second hand book shops.

I wish you all the best.

Hope this helps