If I represented in two sports, will I get double preference?

No. Rules state highest admissible priority from your representations will be considered, not multiple stacked preferences.

What happens if two candidates have same sports priority for one seat?

In tie cases for same sports quota seat, the Common Entrance Test rank is used to decide priority.

The clauses indicate current sports performance up to a maximum period of 3 years will be considered.

Preference is given to individual disciplines over team disciplines within same priority.
Date of birth must match age-category requirements; only recognized board certificate proof is accepted.
Current sports performance window considered is up to maximum 3 years.
Sports achievements between qualifying exam stage and entrance test can be considered, subject to the 3-year limit.
Representation after qualifying the relevant entrance test is not considered for quota claim.
If tie occurs for same sports quota seat, entrance test rank will prevail.
No extra preference for representing multiple games; highest admissible priority only is considered.
Sports Authority scrutiny decision is final; candidates must submit details in prescribed format.