The Guna milan score is 29 out of 36, which is higher then 18 that is required for marriage. However I would like to point out that the horoscope of the Boy is Gemini rising at 1 Degree 20 min. Which means that that in 6 minutes the horoscope changes. Kindly verify if the time of birth of the boy is correct.
To be honest the horoscope of the boy despite strong Gun milan score is not good. My advice to you would be to recheck family, boy, finance, business. Is he someone known to you and your family or randomly you have picked up from the Newspaper/ or online websites. Does your sister approve of this marriage and boy.