How to add points to Australian skilled immigrants' work experience?

Australian skilled immigrants can get up to 20 points for their work experience related to nominating skilled occupations. The details are as follows:

1. Past 3-5 years relevant working experience outside Australia 10 (5 points);

2. Past 10 years 5-8 years relevant working experience outside Australia (10 score);

3. Relevant working experience outside Australia in the past 10 years and 8- 10 years (15 points);

4. Relevant work experience in Australia in the past 10 years 1-3 years (5 points);

5. Past 3-5 years relevant working experience in Australia 10 (10 score);

6. 5-8 years relevant working experience in Australia in the past 10 (15);

7. Relevant working experience in Australia in the past 10 years and 8- 10 years (20 points).