Surahi mudra can be formed by little finger touching other hands ring finger vice verse. Similarly, Joining the forefinger with the middle finger of the other hand. vice verse.
Benefits of Surahimudra:: This mudra sharpens your intellectual and cold and rheumatic inflammation gets relieved
I think this mudra is helpful for you.Also, read my book "Complete Hand Mudras." It will give you more information about mudras read