Reaching Level 30 on Impossible?

[Lex]

I am also interested in this subject. At the moment I am playing Mage on impossible. Before my 1st battle I invested one point in Learning and got Tactics Treatise - so for all my battles since first one I have +20% xp more.

I've tested development of my character in this game and on level 12 I will need to select between +1 def and +480 leadership.

a) If I select leadership at level 12 then at level 31 I should have: +2 attack, +3 def, +11 int, +9640 leadership, +48 mana, +10 rage

b) If I select defense at level 12 then at level 31 I should have: +2 attack, +4 def, +11 int, +10040 leadership, +42 mana, +10 rage

Selecting defense looks here like a better option (much more leadership and +1 defense at cost of -6 mana) but I am not so sure if I manage to get 31.

Some more detailed tables of selected bonuses in total (selected bonus on specified level is bolded)

(after selecting leadership on lvl 12)
Lvl A D .I Lead Mn Rg
25 2 2 10 6280 42 10
26 2 2 10 7320 42 10
27 2 2 10 7320 48 10
28 2 2 10 8440 48 10
29 2 2 11 8440 48 10
30 2 2 11 9640 48 10
31 2 3 11 9640 48 10

(after selecting defense in lvl 12)
Lvl A D .I Lead Mn Rg
25 1 4 09 6560 42 10
26 1 4 10 6560 42 10
27 1 4 10 7640 42 10
28 1 4 11 7640 42 10
29 1 4 11 8800 42 10
30 2 4 11 8800 42 10
31 2 4 11 10040 42 10