Knowledge
All the best to our young guys, Grp 3 & 4.
Here are my advises:
1. Keep on building flying time
2. Take the ATPL exams, even if you dont have plans of activating it yet, at least when the time comes, all you need is a check ride
3. Read on Jeppesen charts
4. Read FAA books, Gleims or ASA
5. Keep your logbooks tidy and in order
Good luck!