It will be tough, but not impossible.
Germany will have to survive. Thats about the only goal the have. Dont buy ftrs, but only inf, and an occasional arm (1st round 9 inf, 1 arm). Dont let the allies hit EEu or WEu while it is underdefended. Dont trade many units. If you cant secure WEu or EEu, leave it empty and setup for a counterstrike. For instance, if you cant hold EEU, than send all arm, ftrs and a few inf to WEu (say 5 inf, 8 arm, 3 ftr) and the remaining units in Ger (and 1-2 inf in SEu in case its threatened). Now EEu will likely be a deadzone. Leave it a deadzone, untill you are strong enough to move into it. Same procedure for WEu, in case pressure is too high. This way Ger has a chance to survive if allies dont play too well.
Jap has to focus on the Russians. That will be main focus. Afrika and Mad/Aus/NZe/Haw are side theaters. Only go after them if there is nothing else to do. Decide wether you want to go for IC’s or transports. Transports are more flexible and a better choice if you expect a tech war… If you are going fors industrial complexes, then dont place them in Kwantung. Its a waste of time. Go for Bur and if save Ind as well. Again focus on inf, and an occasional arm. Focus on getting the allies out of Nov. If you succeed, you have a chance to win the game.
A.