Let School B have \\(x\\) students, School A have \\(x + 200\\).

\\(\begin{aligned}
\text{School A passed} &= 0.75(x + 200) = 0.75x + 150
\\
\text{School B passed} &= 0.60x
\\
\text{Total passed} &= 0.75x + 150 + 0.60x = 1.35x + 150 = 630
\\
1.35x &= 480
\\
x &= \frac{480}{1.35} = \frac{48000}{135} = \frac{3200}{9} \approx 355.56
\\
\text{School A} &= \frac{3200}{9} + 200 = \frac{5000}{9} \approx 555.56
\end{aligned}\\)

Final Answer: School A \\(\frac{5000}{9}\\), School B \\(\frac{3200}{9}\\)