Here, the order of priority is assigned as follows:
Following rule 1, amino group gets first priority.
Following rule 3, carboxylate group gets second priority as shown below.

Following rule 2, methyl group gets third priority over hydrogen.

Here, the order of priority is assigned as follows:
Following rule 1, bromo group gets first priority.
Following rule 2, propyl group gets second priority ahead of methyl group.
Following rule 2, methyl group gets priority over hydrogen.

Here, the order of priority is assigned as follows:

Following rule 1, bromo group gets first priority.
Following rule 3, carbonyl group gets second priority.