Is it good to take omega 3 tablets if a person has high uric acid n kidney stones?

No: It has no value for these issues.

Omega 3: Omega 3 is excellent - it will not affect stones but will improve vascular health: Diet matters; avoid organ meats; fatty meats and alcohol will elevate uric acid. Avoid these. Also, drink at least 3 liters fluid per day - this may enhance uric acid excretion - and incline diet successfully to mostly whole grain, fruit, and veggies, and nuts, using white fish and egg white;