Well... I say the answer depends.
For anything related to Light arts, sure you'll be fine. Can gear for +MP on light arts without problem most of the time (With appropriate Enhancing and -Enmity macros).
Dark Arts however, is a whole different animal. You might not want to hear this; but truth to be told: SCH's nuking selection is very, very poor on +MP - it's the rarest of our nuking stats.
To give you an idea, with the best possible nuking gear on my SCH I'd hover at arond 700 (713) MP as a hume with 8/8MP merits.
My hume's base HP/MP/INT is 1029/563/70. Galkas base HP/MP/INT is 1241/364/67. If I where to use the SAME gear/merits, you'd have 514 Max MP while nuking and 3 less INT. 514 is awfully low, so obviously you'd have to wear some +MP pieces until you reach 500ish before swapping to full damage.
I have listed the probably "Best possible" and what you'd want to use instead for TIV's before 500MP mark. Weapon/Waist Excluded as they should have the corresponding Staff/Obi. Ugga not counted as +MP due to latent only working at half mp.
Sub: Buguard Strap +1 ---------------------> Staff Strap (+10MP, -1INT)
Ammo: Phantom Tathlum --------------------> Hedgehog Bomb (+20MP, -2INT)
Head: Scholar's Mortabard +1
Body: Red Redingote
Hands: Yigit Gages (instead of vicious for comparison) ----------> Mahatma Cuffs (+25MP +1INT -2Mab) or or Dune Bracers (+65MP -3INT -2MAB).
Legs: Mahatma Slops -----------------------> Jet Seraweels (+15MP -1INT)
Feet: Yigit Crackows ----------------------> Cobra Crackows (+22MP -3INT +1MAB)
Neck: Prudence Torque/Uggalepih Pendant
Earrings: Novio/Moldavite
Rings: Tamas/Snow
Back: Gleeman's Cape ----------------------> Prism Cape (+30MP -1INT)
So in this comprison, you'd have 636MP while nuking if using Mahatma Cuffs, and 676 if using Dune bracers. The losses are of about 7INT 1MAB with Mahatma and 10INT 2MAB on Dune bracers.
But this is still a bit low, so you'd have to carry an overboard, +MP (Serket, Morganas Chocker, etc) gear on top of this Hybrid gear; and nuke in those +MP before you reach this 670ish MP. Nuke with the hybrid until you reach 500MP; then swap in full damage gear.
Overly complicated? Yes. You'll have to go that extra mile if you want Galka SCH to work well. But you can still be a good SCH as a Galka.
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- Pythagoras