Assuming we are talking FC here, Don't think Sandeep Sharma is ready from what i've seen. Aaron as i said above is a crock.
In terms of Seamers from what i've seen/heard and their performances i'd pick Sidharth Kaul, Ishwar Pandey, Mohit Sharma, Shami Ahmed, Pankaj Singh.
Batting options would be Jiwanjot Singh, Unmukt Chand, Ambati Rayudu, Robin Bist, Rohit Sharma along with Maybe Jaggi competing with others and 1/2 dropping from the first team. Would like to select Mukund as a opener too if we can ignore the season's performances.
One spinner is a Cert in Rasool who can bat as a lower middle order batsman too. Other one is tougher though and would be between Nadeem/Ladda probably.
Rishi Dhawan is a interesting prospect as a seam bowling all rounder but his bowling isn't great right now in terms of being a strike bowler and his batting is again a lower order bat.
Keeper would be Gautam or Saha.. Uday Kaul in contention.
I would pick Dhawan and Vijay as main openers in the A team and Mukund as the backup opener. Our next series is in SA so its best that they both play in this A tour so that they get used to the SA conditions
Ideally, I'd prefer they don't play the more experienced blokes such as Dhawan, Badri, Mishra, Pankaj and Vinay in the India A team, and instead, fill that team with fresh, young players, who can go on tour to learn. The more experienced players can play for Board President's XI, facing touring sides. They can, however, play a few experienced players in the A team to guide the younger players along each tour. Dhawan and Rahane would be the right choice here, to open the innings.
Aaron may come in on the back of a good season, for want of options with express pace. Nobody else will cut down on pace, and we even hear Umesh Yadav thinking of cutting down on pace. Pankaj Singh has increased his pace, but it's not over 140K. Unfortunately, none of them are match-fit, and this shows how poor BCCI's injury-management and performance-management system really is.
Rassool is a certainty as a spinner, especially because he's also a very productive batsman, and five bowlers can be played alongside him. He's been the best all-rounder in this Ranji season. The other will easily be Shahbaz Nadeem for FC and Iqbal Abdulla for LA.
Rishi Dhawan will make it easily, again, for want of options- as a strike seamer who can also score runs. Surely a better contender than Ashish Reddy.
Jiwanjyot, Jaggi, Kedar, Rohit Sharma, Mukund (his current post-Ranji form is a lot better), and Rayudu as a senior guide for the rest of the team, will be a good list to choose from. They're never short of options for batting, or wicketkeeping (Gautam, Saha, Uday Kaul), but strike-bowler all-rounders and also fast bowlers (not seam/swing bowlers) are hard to catch, and A-team tours should focus on developing players for these roles. And also get their best spinners productive overseas.