I’m not very good at Classic, but I’ll throw my two cents in.
Typically, I commit 1-2 rounds of shucking INF from South Europe -> Africa to try to rack up some IPCs. After the first two rounds or so you’re going to need 100% of your IPCs to commit to the stack war in Eastern Europe Vs. USSR/UK.
If UK wastes their money on a South Africa/India IC I’d punish them by committing the Germans to a Egypt -> Syria -> Persia -> India trajectory, while also sending as much of Japan’s navy as possible towards India to take the free factory. If Japan/Germany can break a hypothetical India Factory early on, it can give Japan some real momentum in gobbling up IPCs in Africa + putting pressure on Russia.
Remember: In Classic, Germany has to play defensively, as they stand no chance of breaking Karelia unless your opponent is really weak. Japan has to be the main breadwinner for the Axis, abusing the weak starting setup for the Allies in Asia and the typical hyper-KGF Allied strategy to try to either take Moscow or win an “economic victory” before the Allies manage to break Germany.