Try to improve your answering response time by practicing as many mock tests as possible, Youth4work has good collection of prep exams for bank exams.
Focus on your problem areas, like vocabulary, synonyms, antonyms, word power.
Improve your English laguage understanding by reading more, then unseen passages will become easy to solve.
For more practice and prep material click on the following links
Try IBPS RRB OA 2018 mock test by CLICKING HERE
Practice previous year question papers: CLICK HERE
To download IBPS RRB Mock prep Test App in English: CLICK HERE
To download IBPS RRB Mock prep Test App for Hindi prep: CLICK HERE
Try all the previous year papers and practice them : CLICK HERE
Practice with Mock Tests On Youth4work's site to improve your score in all the sections including the english section. CLICK HERE to reach to the Mock Test of IBPS RRB Office Assistant Main Exam.
Unfortunately 10 days are too less to improve your English section when it comes to competitive exams like IBPS PO RRB etc. All you have to do at this point of time is to just go through the basics and look for some good questions for solving and for long term I would like to tell you to go through WORD POWER MADE EASY by Norman Lewis it will help for sure..
concentrate your grammar
ten days sufficient for clear English cutoff..please do u read more vocab and grammertical rules..I give u my good wishes for exam.