My overall percentile is around 30 how to increase for 80 percentile

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There is no time for completing the syllabus, so start with the important topic in each section.
LR/DI- Take mocks as much as you can, nothing called fixed syllabus in it.
Quant- do any 2 topics such as arithmatic being the important one, and 2nd topic of your choice, do not go on to cover the entire syllabus,
english- again mocks practice and readings.

Bhai SNAP k liya padla simple

stop giving mocks for now and first of all complete the important topics from the syllabus that r asked every year and their basics. your percentile after that will start improving gradually,also practise as much as u can.
Meanwhile continue to read for varc and give sectional mocks for lrdi

Thanks a lot friends...