You don't need to secure 60% in both 11th and 12th grades. Your average aggregate should be minimum 60%.

DASA doesn't care if you secure 59% in 11th grade and 70% in 12th grade.
You must obtain at least 60% on average (both the grades).
For futher details, check [url=https://www.testprepkart.com/sat/blog-single.php?id=385/The-Ultimate-Guide-of-DASA-2018]DASA 2019[/url] guide.