Hello I have this econometrics question that I have to solve without computer.

Question

(True model) yi = B0 + B1x1i + B2x2i + B3x3i + ui

(Regression model) ^yi = 13.16 - 0.052(x1i - x21) + 0.2x3i
SST = 1833
R^2 = known
R^2 (bar) = known
n = known

with the standard errors being respectively: (0.403) (0.121) (0.136)

I want to test the hypothesis that
H0: B1 = B2 = B3
alpha = 1%

Thank you for your help!