School Exchange

The school exchange are stages that drop materials required to upgrade the Unique weapons of students. Unique equipments are unlocked once a student has been leveled up to 5 stars and provide bonus stats to the student. These bonus stats can be viewed on their respective page from Characters.

In school exchange, you will battle select students from their respective school. Currently, there are 3 schools which include (top to bottom): Trinity, Gehenna, and Millennium. Each school also consists of 3 stages, A-C, where the latter stages are more significantly challenging but include better rewards, similar to Bounty Hunts or Commissions.

Different schools will drop different upgrade materials which caters towards different guns. Trinity, Gehenna, and Millenium will respectively drop springs, hammers, and gun barrels. Springs will have a 1.5 xp multiplier when used to upgrade SMGs, SGs, and HGs; Hammers on ARs and GLs; And, gun barrels on MGs, SRs, MTs, and RGs. Firing pins will have a universal 1.5 xp multiplier.

Starting or sweeping a stage requires AP and tickets. 2 tickets are given for each school daily but more can be bought in the shop for 30 pyroxene. Below is a table displaying the drop rates for each stage.

**Trinity / Gehenna / Millennium**
Stage	T1 Material		T2 Material		T3 Material		T4 Material
Stage	Qty	Chance	Qty	Chance	Qty	Chance	Qty	Chance
A	1	100.00%	1	50.00%
B			1	100.00%	1	7.50%
C	2	100.00%	1	100.00%	1	12.00%	1	4.00%

Credits to Noxy#8299 and アイザヱー#6944 for data

Recommended Units & Strategies

The following strategies are primarily for stage C but most can be applied to earlier stages as well.

**Trinity**
Recommended Students	Strategies
File:Student Portrait Tsubaki.pngFile:Student Portrait Iori.pngFile:Student Portrait Maki.png File:Student Portrait Aru.pngFile:Student Portrait Mutsuki.pngFile:Student Portrait Karin.png File:Student Portrait Ako.pngFile:Student Portrait Hibiki.pngFile:Student Portrait Serina.png	Only one red DPS is recommended solely for Hifumi. Iori and Maki are practically a must in stage C. Karin can be included if your yellow DPS is still lacking. Serina can be used at the beginning of the battle to relocate Tsubaki towards the middle of the enemies. This causes Hifumi to use her EX out of range of your DPS. Iori can always hit both Azusa and Hasumi at the beginning of the battle. Getting rid of the two early on will help save time. If you are struggling with Tsurugi healing too fast, wipe Koharu and lower any other student. This will bait Hanako's healing onto them at which you're free to focus Tsurugi.

**Gehenna**
Recommended Students	Strategies
File:Student Portrait Tsubaki.pngFile:Student Portrait Iori.pngFile:Student Portrait Azusa.png File:Student Portrait Aru.pngFile:Student Portrait Mutsuki.pngFile:Student Portrait Koharu.png File:Student Portrait Ako.pngFile:Student Portrait Hibiki.pngFile:Student Portrait Serina.png	Like Trinity but a focus on red DPS now. Only one yellow DPS is recommended for Kayoko. It is recommended to take out Kayoko first or else her EX might wipe your back students at ~37 seconds. Serina can be used again to reposition Tsubaki away from your other students. That way, enemy students' EX won't be in range of your students.

**Millennium**
Recommended Students	Strategies
File:Student Portrait Tsubaki.pngFile:Student Portrait Aris.pngFile:Student Portrait Azusa.png File:Student Portrait Aru.pngFile:Student Portrait Azusa Swimsuit.pngFile:Student Portrait Koharu.png File:Student Portrait Haruna.pngFile:Student Portrait Hibiki.pngFile:Student Portrait Serina.png	Serina reposition is important in this stage as well when Midori and Momoi activate their EX at ~20 seconds which can easily wipe your back students. Moving Tsubaki as much to the side is recommended to avoid your back students being hit by the numerous amounts of AOE EX skills in this stage. Alternatively, you could skill cancel with Tsubaki's taunt. It is recommended to take out Midori first due to her damage, followed by Kotori due to her shields. Two healers is recommended due to the amount of damage your students will sustain.