wackerly first. Most people recommend Freund's Mathematical Statistics but since wackerly takes us through each and every concept with proper examples and solutions I always had a liking for the latter. Also, you will find the pdf format of wackerly solutions online, detailed ones. So, I think it's better to pick wackerly.
For macro basics I studied macroeco by mankiw, then dornbusch, fisher, and startz followed by Branson. ( I liked Branson alot because of it being mathematical and me being on that side)
For Ecotrix, I would say don't look beyond Essentials of econometrics by Gujarati. (Do it after going through statistics)
For statistics I always had a liking for sc gupta and vk kapoor since my college days and this is the single book I studied for it.
my advice is just try to get the concept and practice as much as possible.
Some books to follow
Quantitative altitude by Rs agrawal.This book is just for overall aptitude but not so much helpful for permutation and combination.
Cat Arun Sharma ,This is the best book ever I seen for all topics.