300 problems in special and general relativity with complete solutions pdf link
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Time dilation, length contraction, and the "Twin Paradox." Dynamics: Relativistic momentum, energy-mass equivalence ( ), and collisions.

If you are looking for a number close to 300, this is your best bet for Special Relativity. It breaks down the math into digestible steps.

Manifolds, metrics, and covariant derivatives.

Move from basic Lorentz transformations to complex tensor calculus.