The high-profile two-match Test series between India and Sri Lanka is only a few nights away, and the preparations are going on in full swing. For that, Gautam Gambhir and his team will have to overcome past mistakes to come out on top on the challenging subcontinent wickets. On that note, let's take a look at three costly mistakes that India made on past subcontinent tours that they should avoid in this series. Ad#3 Letting opposition lower-order batters off the hookIndian bowlers have consistently allowed opposition tail-enders to build frustrating 50+ run partnerships for the eighth, ninth, and 10th wickets. The team should continue to maintain aggressive, attacking fields and ruthless bowling tactics against opposition lower-order batters.