| Athletics | Four National Champions in Discus, Javelin and 1500m |
| Athletics | Multiple County and Regional Champions |
| Athletics | Five Junior County Champions |
| Athletics | Ranked 3rd in the country in National Finals medal table |
| Athletics | Winners of multiple regional team events |
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| Cross Country | East Grinstead Schools Champions for 5th successive year |
| Cross Country | Qualifiers for National Finals at Malvern College |
| Cross Country | Winners of English Schools County Championships |
| Cross Country | Unbeaten in local schools competition in 2017/18 |
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| Boys' Football | Winners U12 and U13 IPS London 6s |
| Boys' Football | Winners Brambletye 6s |
| Boys' Football | Winners Copthorne 6s |
| Boys' Football | Winners IAPS Regional Finals |
| Boys' Football | Qualified for National 6s Finals |
| Boys' Football | U11 Ardingly 6s Winners |
| Boys' Football | National Cup Quarter Finalists |
| Boys' Football | 1st XI unbeaten in 2018 |
| Boys' Football | Winners of Seaford U9 Tournament |
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| Girls' Football | Qualified for National Finals at St George's Park |
| Girls' Football | Winners of several local tournaments |
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| Hockey | Seaford tournament winners |
| Hockey | IN2H Tournament Winners |
| Hockey | Qualified for IN2H Regional Finals |
| Hockey | Qualified for IAPS National Finals boys and girls |
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| Netball | Top 3 finishes in SISNA Tournament |
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| Rounders | 3rd Place in IAPS Regional Championship |
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| Swimming | Unbeaten in 41 galas |
| Swimming | Multiple Qualifiers for National Finals |
| Swimming | Five Top 10 finishes at National Level |
| Swimming | Winners East Grinstead Schools Gala |
| Swimming | County Relay Champions qualifying for National Finals |
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| Fencing | Multiple winners at county and national level |
| Fencing | Record national medal hall in 2018 |
