80c exemption

Sec. 80C exemption cannot be availed if investment is made after 31st March.
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sub-sec (1) of sec. 80C says that,
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“In computing the total income of an assessee, being an individual or a Hindu undivided family, there shall be deducted, in accordance with and subject to the provisions of this section, the whole of the amount paid or deposited in the previous year, being the aggregate of the sums referred to in sub-section (2), as does not exceed one lakh rupees.”
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And as per sec. 3, previous year means the financial year immediately preceding the assessment year.

no, one has to invest in respective previous year to get the benefit u/s 80c to 80u