There is nothing mentioned for 2018 recruitment of ISRO but as per previous year information to apply for the same you will have to get 65% or above in B.E/B.Tech from a recognised university. Age should not exceed 35 years and the selection process is of 2 stages like first one is Written Test and those candidates who qualify the WT are eligible for Personal Interview. Also, to join ISRO as a scientist it is mandatory to have great knowledge of your subjects.

Good Luck!!!