Thats a really good score. Actually the questions in test series are relatively more difficult than the questions in examination. So there are chances that you can score even better than this, but the only thing is to have patience in exam hall. 

Now, you should start practising previous year question papers in prescribed time along with the test series. The most important thing is, after test give sufficient time to attempt those questions which you left in test and analyse your mistakes. Do this for every test either it is previous year paper or mock paper. By analysing paper, you will get to know about your mistakes and improve them. 

As you are in coaching you would be having short notes, start revising your notes from the last week of April because in this exam having cleared concepts will only help you out. 

Complete your revision 2 days before the final examination so that you can be relaxed the day before the exam. Don't panic during the examination, try to be calm and be confident. You will surely succeed.

Best of Luck!!