Dear Atul,

70 Marks in JEE Mains is very less to take admission in RGIT Mumbai in any branch. Your Rank will be approximately 128000 which is very high. To get admission in RGIT Mumbai a candidate must have Rank 42115 then he/she will get admission in BE Instrumentation Engineering which is the lowest branch of college and to take admission in BE Information Technology maximum Rank a candidate have is 5670. So you won't get admission with this marks. Do lose hope there are many colleges in which you can get admission. 

Thank you

Best Wishes!