My portfolio (beginner, please review)

Portfolio update.
My core holdings are
ATFL
KCP ltd.
Repro India
Rain industries

I'm slowly accumulating Smartlink network systems as execution plays out.
I hold exide industries.
NESCO I will be slowly adding over the period of one year as execution plays out and we know the impact of the new competition.
I have closely tracking Centrum capital and will take up a small position in them keeping an eye on execution over the next 3 quarters. Stock will fall now just like sintex.
I will be adding two-three more scrips and then portfolio stay the same for next 3-5 years hopefully.
I'm also looking at arihant superstructures.
Betting on Centrum management is the rationale for the investment, no fancy valuation metrics etc: